WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Total Dist	Ending Class Bal
A1	939336NX7	$355,455,000.00	$90,560,028.24	1.7100000000%	1.7100000000%	$129,048.04	$90,560,028.24	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$90,689,076.28	$0.00
A2	939336NY5	$279,374,000.00	$279,374,000.00	2.9200000000%	2.9200000000%	$679,810.07	$56,338,643.46	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$57,018,453.53	$223,035,356.54
A3	939336NZ2	$230,683,000.00	$230,683,000.00	3.7200000000%	3.7200000000%	$715,117.30	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$715,117.30	$230,683,000.00
A4	939336PA5	$201,852,000.00	$201,852,000.00	4.1300000000%	4.1300000000%	$694,707.30	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$694,707.30	$201,852,000.00
A5	939336PB3	$326,065,000.00	$326,065,000.00	3.9700000000%	3.9700000000%	$1,078,731.71	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,078,731.71	$326,065,000.00
A6	939336PC1	$482,490,000.00	$390,767,224.79	4.5570835469%	4.5570835469%	$1,483,965.74	$50,865,268.42	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$52,349,234.16	$339,901,956.37
X	939336PK3	$153,532,321.00	$120,494,578.88	4.0000000000%	4.0000000000%	$401,648.60	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$401,648.60	$103,360,953.22
B1	939336PD9	$20,264,000.00	$20,227,099.55	4.5570835469%	4.5570835469%	$76,813.82	$6,158.13	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$82,971.95	$20,220,941.42
B2	939336PE7	$15,440,000.00	$15,411,883.97	4.5570835469%	4.5570835469%	$58,527.70	$4,692.14	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$63,219.85	$15,407,191.83
B3	939336PF4	$7,720,000.00	$7,705,941.98	4.5570835469%	4.5570835469%	$29,263.85	$2,346.07	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$31,609.92	$7,703,595.91
B4	939336PG2	$2,895,000.00	$2,889,728.24	4.5570835469%	4.5570835469%	$10,973.94	$879.78	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,853.72	$2,888,848.46
B5	939336PH0	$2,895,000.00	$2,889,728.24	4.5570835469%	4.5570835469%	$10,973.94	$879.78	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$11,853.72	$2,888,848.46
B6	939336PJ6	$4,825,205.53	$4,816,418.89	4.5570835469%	4.5570835469%	$18,290.69	$1,466.36	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$19,757.04	$4,814,952.53
SFEE	XXXXXXXXX	$1,393,429,000.00	$1,128,534,028.24	0.6237722751%	0.6237722751%	$586,623.53	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$586,623.53	$981,635,356.54
R	939336RV7	$100.00	$0.00	0.0000000000%	0.0000000000%	$0.92	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.92	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total		$1,929,958,305.53	$1,573,242,053.90			$5,974,497.15	$197,780,362.38	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$203,754,859.53	$1,375,461,691.52

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003

Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1	$355,455,000.00	$90,560,028.24	$0.00	$0.00	$90,560,028.24	0.0000000000	$0.00
A2	$279,374,000.00	$279,374,000.00	$0.00	$0.00	$56,338,643.46	0.7983397043	$223,035,356.54
A3	$230,683,000.00	$230,683,000.00	$0.00	$0.00	$0.00	1.0000000000	$230,683,000.00
A4	$201,852,000.00	$201,852,000.00	$0.00	$0.00	$0.00	1.0000000000	$201,852,000.00
A5	$326,065,000.00	$326,065,000.00	$0.00	$0.00	$0.00	1.0000000000	$326,065,000.00
A6	$482,490,000.00	$390,767,224.79	$0.00	$0.00	$50,865,268.42	0.7044746137	$339,901,956.37
X	$153,532,321.00	$120,494,578.88	$0.00	$0.00	$0.00	0.6732195055	$103,360,953.22
B1	$20,264,000.00	$20,227,099.55	$0.00	$0.00	$6,158.13	0.9978751194	$20,220,941.42
B2	$15,440,000.00	$15,411,883.97	$0.00	$0.00	$4,692.14	0.9978751185	$15,407,191.83
B3	$7,720,000.00	$7,705,941.98	$0.00	$0.00	$2,346.07	0.9978751179	$7,703,595.91
B4	$2,895,000.00	$2,889,728.24	$0.00	$0.00	$879.78	0.9978751157	$2,888,848.46
B5	$2,895,000.00	$2,889,728.24	$0.00	$0.00	$879.78	0.9978751157	$2,888,848.46
B6	$4,825,205.53	$4,816,418.89	$0.00	$0.00	$1,466.36	0.9978751164	$4,814,952.53
SFEE	$1,393,429,000.00	$1,128,534,028.24	$0.00	$0.00	$0.00	0.7044746137	$981,635,356.54
R	$100.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
Total	$1,929,958,305.53	$1,573,242,053.90	$0.00	$0.00	$197,780,362.38	0.7126898481	$1,375,461,691.52

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
A1	$355,455,000.00	254.77213217	0.00000000	0.00000000	254.77213217	0.0000000000	0.00000000
A2	$279,374,000.00	1,000.00000000	0.00000000	0.00000000	201.66029573	0.7983397043	798.33970427
A3	$230,683,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A4	$201,852,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A5	$326,065,000.00	1,000.00000000	0.00000000	0.00000000	0.00000000	1.0000000000	1,000.00000000
A6	$482,490,000.00	809.89704406	0.00000000	0.00000000	105.42243035	0.7044746137	704.47461371
X	$153,532,321.00	784.81571890	0.00000000	0.00000000	0.00000000	0.6732195055	673.21950549
B1	$20,264,000.00	998.17901451	0.00000000	0.00000000	0.30389508	0.9978751194	997.87511942
B2	$15,440,000.00	998.17901360	0.00000000	0.00000000	0.30389508	0.9978751185	997.87511852
B3	$7,720,000.00	998.17901295	0.00000000	0.00000000	0.30389508	0.9978751179	997.87511788
B4	$2,895,000.00	998.17901209	0.00000000	0.00000000	0.30389637	0.9978751157	997.87511572
B5	$2,895,000.00	998.17901209	0.00000000	0.00000000	0.30389637	0.9978751157	997.87511572
B6	$4,825,205.53	998.17901228	0.00000000	0.00000000	0.30389586	0.9978751164	997.87511642
SFEE	$1,393,429,000.00	809.89704408	0.00000000	0.00000000	0.00000000	0.7044746137	704.47461373
R	$100.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A1	$355,455,000.00	1.7100000000%	1.7100000000%	$90,560,028.24	$129,048.04	$0.00	$0.00	$0.00	$129,048.04
A2	$279,374,000.00	2.9200000000%	2.9200000000%	$279,374,000.00	$679,810.07	$0.00	$0.00	$0.00	$679,810.07
A3	$230,683,000.00	3.7200000000%	3.7200000000%	$230,683,000.00	$715,117.30	$0.00	$0.00	$0.00	$715,117.30
A4	$201,852,000.00	4.1300000000%	4.1300000000%	$201,852,000.00	$694,707.30	$0.00	$0.00	$0.00	$694,707.30
A5	$326,065,000.00	3.9700000000%	3.9700000000%	$326,065,000.00	$1,078,731.71	$0.00	$0.00	$0.00	$1,078,731.71
A6	$482,490,000.00	4.5570835469%	4.5570835469%	$390,767,224.79	$1,483,965.74	$0.00	$0.00	$0.00	$1,483,965.74
X	$153,532,321.00	4.0000000000%	4.0000000000%	$120,494,578.88	$401,648.60	$0.00	$0.00	$0.00	$401,648.60
B1	$20,264,000.00	4.5570835469%	4.5570835469%	$20,227,099.55	$76,813.82	$0.00	$0.00	$0.00	$76,813.82
B2	$15,440,000.00	4.5570835469%	4.5570835469%	$15,411,883.97	$58,527.70	$0.00	$0.00	$0.00	$58,527.70
B3	$7,720,000.00	4.5570835469%	4.5570835469%	$7,705,941.98	$29,263.85	$0.00	$0.00	$0.00	$29,263.85
B4	$2,895,000.00	4.5570835469%	4.5570835469%	$2,889,728.24	$10,973.94	$0.00	$0.00	$0.00	$10,973.94
B5	$2,895,000.00	4.5570835469%	4.5570835469%	$2,889,728.24	$10,973.94	$0.00	$0.00	$0.00	$10,973.94
B6	$4,825,205.53	4.5570835469%	4.5570835469%	$4,816,418.89	$18,290.69	$0.00	$0.00	$0.00	$18,290.69
SFEE	$1,393,429,000.00	0.6237722751%	0.6237722751%	$1,128,534,028.24	$586,623.53	$0.00	$0.00	$0.00	$586,623.53
R	$100.00	0.0000000000%	0.0000000000%	$0.00	$0.92	$0.00	$0.00	$0.00	$0.92
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
Total	$1,929,958,305.53			$1,573,242,053.90	$5,974,497.15	$0.00	$0.00	$0.00	$5,974,497.15

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
A1	$355,455,000.00	1.7100000000%	1.7100000000%	254.77213217	0.36305029	0.00000000	0.00000000	0.00000000	0.36305029
A2	$279,374,000.00	2.9200000000%	2.9200000000%	1,000.00000000	2.43333335	0.00000000	0.00000000	0.00000000	2.43333335
A3	$230,683,000.00	3.7200000000%	3.7200000000%	1,000.00000000	3.10000000	0.00000000	0.00000000	0.00000000	3.10000000
A4	$201,852,000.00	4.1300000000%	4.1300000000%	1,000.00000000	3.44166667	0.00000000	0.00000000	0.00000000	3.44166667
A5	$326,065,000.00	3.9700000000%	3.9700000000%	1,000.00000000	3.30833334	0.00000000	0.00000000	0.00000000	3.30833334
A6	$482,490,000.00	4.5570835469%	4.5570835469%	809.89704406	3.07564041	0.00000000	0.00000000	0.00000000	3.07564041
X	$153,532,321.00	4.0000000000%	4.0000000000%	784.81571890	2.61605242	0.00000000	0.00000000	0.00000000	2.61605242
B1	$20,264,000.00	4.5570835469%	4.5570835469%	998.17901451	3.79065436	0.00000000	0.00000000	0.00000000	3.79065436
B2	$15,440,000.00	4.5570835469%	4.5570835469%	998.17901360	3.79065415	0.00000000	0.00000000	0.00000000	3.79065415
B3	$7,720,000.00	4.5570835469%	4.5570835469%	998.17901295	3.79065415	0.00000000	0.00000000	0.00000000	3.79065415
B4	$2,895,000.00	4.5570835469%	4.5570835469%	998.17901209	3.79065285	0.00000000	0.00000000	0.00000000	3.79065285
B5	$2,895,000.00	4.5570835469%	4.5570835469%	998.17901209	3.79065285	0.00000000	0.00000000	0.00000000	3.79065285
B6	$4,825,205.53	4.5570835469%	4.5570835469%	998.17901228	3.79065511	0.00000000	0.00000000	0.00000000	3.79065511
SFEE	$1,393,429,000.00	0.6237722751%	0.6237722751%	809.89704408	0.42099277	0.00000000	0.00000000	0.00000000	0.42099277
R	$100.00	0.0000000000%	0.0000000000%	0.00000000	9.20000000	0.00000000	0.00000000	0.00000000	9.20000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMU 03AR1 WEIGHTED AVERAGE PC RATE: 4.55708%
POOL NUMBER: 2037
ISSUE DATE: 01/28/2003
CERTIFICATE BALANCE AT ISSUE: $1,929,958,305.53
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	2620		$1,573,242,053.94
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$478,973.09
Unscheduled Principal Collection/Reversals		$2,749,424.87
Liquidations-in-full	299	$194,551,964.42
Net principal Distributed		$197,780,362.38	-$197,780,362.38

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	2321		$1,375,461,691.57

SCHEDULED INTEREST AT MORTGAGE RATE:		$6,944,663.37

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$970,166.22

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$203,754,859.53

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WAMU 03AR1 WEIGHTED AVERAGE PC RATE: 4.55708%
POOL NUMBER: ALL
ISSUE DATE: 01/28/2003
CERTIFICATE BALANCE AT ISSUE: $1,929,958,305.53
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	2620		$1,573,242,053.94
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$478,973.09
Unscheduled Principal Collection/Reversals		$2,749,424.87
Liquidations-in-full	299	$194,551,964.42
Net principal Distributed		$197,780,362.38	-$197,780,362.38

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	2321		$1,375,461,691.57

SCHEDULED INTEREST AT MORTGAGE RATE:		$6,944,663.37

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$970,166.22

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$203,754,859.53

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Pool - 2037		$197,780,362.38		$5,974,497.15		$203,754,859.53
Aggregate		$197,780,362.38		$5,974,497.15		$203,754,859.53

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Pool - 2037	$1,573,242,053.94	2620	299	2321	$1,375,461,691.57	$478,973.09	$194,551,964.42	$2,749,424.87	$197,780,362.38
Aggregate	$1,573,242,053.94	2620	299	2321	$1,375,461,691.57	$478,973.09	$194,551,964.42	$2,749,424.87	$197,780,362.38

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Pool - 2037	12	$6,994,771.59	2	$1,038,121.86	0	$0.00	1	$734,000.00
Aggregate	12	$6,994,771.59	2	$1,038,121.86	0	$0.00	1	$734,000.00

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Pool - 2037		1		$396,892.75		0		$0.00
Aggregate		1		$396,892.75		0		$0.00

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(2037)			0			$0.00
Aggregate			0			$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003

INSURANCE RESERVES - Group 1(2037)
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$0.00	$0.00	$0.00	$0.00	$0.00
Bankruptcy Bond
Single-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003

The Group B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated January 24, 2003 to that certain Prospectus Supplement, dated November 21, 2002, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the B certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.



The Class Principal Balances of each Class of the Class B1,B2,B3,B4,B5,B6 Certificatesimmediately after the principal and interest distribution on 200308 are as follows:

Class			Class Principal Balance
B1			$20,220,941.42
B2			$15,407,191.83
B3			$7,703,595.91
B4			$2,888,848.46
B5			$2,888,848.46
B6			$4,814,952.53
Total			$53,924,378.61
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $0.00, $0.00, $0.00 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WAMU.03AR1
Distribution Date: 08/25/2003

Aggregate ARM Information by Group
Pool ID	Netwac	Margin
Pool - 2037	4.55708%	2.01062%
Aggregate	4.55708%	2.01060%

WAMU MORTGAGE PASS THROUGH CERTIFICATES SERIES 2003-AR1 8-K