I bought a pair of kicker SSMB6 6.5" speakers for my doors. They didn't come with mounting brackets because they are supposed to fit in the stock locations but my car is Swedish (99 SAAB 9-5) and the stock mounting bracket is slightly smaller (metric maybe?) and I can't get my speakers to fit in them at all.
Go to a store that deals in audio equipment only. They should have what you are looking for. Or maybe try your nearest Radio Shack Store. As they always say... "You've got questions... We've got answers." That seems to be their favorite slogan anyway. So I would try Radio Shack.
NEW JBL CONTROL SERIES MTC-28/25CM BLACK CEILING MOUNT MOUNTING BRACKET (1 PAIR), 00 01 02 03 04 FORD FOCUS G2-M3 MANUAL SIDE MIRRORS BLUE/AMBER LED CLEAR LENS, 88-98 GMC CHEVY C/K C10 FULL SIZE G2-M3 POWER MIRROR BLUE/AMBER LED SMOKE LENS, 90 91 92 93 HONDA ACCORD 4DR G2-M3 SMOKE MANUAL MIRRORS BLUE ARROW LED LIGHTS, 92-95 HONDA CIVIC 4D 4DR G2 M3 SMOKE POWERED MIRRORS BLUE ARROW LED LIGHTS 93 94, 94-01 DODGE RAM G2-M3 POWERED SIDE MIRROR BLUE ARROW LED LIGHT 95 96 97 98 99 00, 93-97 TOYOTA COROLLA G2 M3 MANUAL SIDE MIRRORS BLUE ARROW LED LIGHT 93 94 95 96, Pair 1917-1923 Model T Ford Roadster Touring Windshield Brackets Cowl Lamp Mount, 92-95 HONDA CIVIC 2/3D G2 M3 POWER MIRROR BLUE/AMBER LED LIGHT SMOKE LENS 93 94, 00-05 DODGE NEON G2 M3 POWER SIDE MIRRORS BLUE/AMBER LED LIGHT SMOKE LENS 03 04, 95-99 NISSAN MAXIMA G2 SMOKE MANUAL MIRRORS BLUE ARROW LED SIGNAL LIGHT 96 97 98, 93-97 TOYOTA COROLLA G2 M3 POWER MIRROR BLUE ARROW LED SIGNAL LIGHT 93 94 95 96, NIP Two Pairs of Inside Mount Shade Brackets, Newell 12822, New AFCO Ford 9" Steel Torque Top Link Brackets, Forward Mount, 3/8" Holes, Pair, New AFCO Quick Change Torque Top Link Brackets, Forward Mount, 3/8" Hole, Pair, 92-95 HONDA CIVIC 4DR G2 M3 POWERED SIDE MIRRORS BLUE/AMBER LED SMOKE LENS 93 94, 94-01 DODGE RAM G2-M3 SMOKE POWERED SIDE MIRROR BLUE/AMBER LED 95 96 97 98 99 00, 90 91 92 93 HONDA ACCORD 4DR G2-M3 POWERED SIDE MIRROR BLUE/AMBER LED SMOKE LENS, 82-93 S10 S15 SONOMA G2 MANUAL SIDE MIRRORS BLUE ARROW LED SMOKE 83 84 85 86 87, 95-99 NISSAN MAXIMA G2 M3 POWER SIDE MIRROR BLUE ARROW LED SIGNAL LIGHT 96 97 98, 97-03 FORD F-150 F-250 G2 M3 MANUAL MIRROR BLUE ARROW LED SIGNAL LIGHTS 98 99 00, 89-95 BMW E34 G2-M3 MANUAL MIRRORS BLUE ARROW LED SIGNAL LIGHTS 90 91 92 93 94, 93-97 NISSAN ALTIMA G2 M3 MANUAL SIDE MIRROR BLUE/AMBER LED LIGHT CLEAR 94 95 96, 97-03 FORD F-150 F-250 G2 M3 SMOKE POWER SIDE MIRRORS BLUE ARROW LED LIGHT 01 02, 99-04 Ford F250, F350 Super Duty pair of front leaf spring mounting brackets, 00-05 DODGE NEON G2 M3 MANUAL SIDE MIRROR BLUE ARROW LED TURN SIGNAL LIGHT 01 02, 1994-2001 ACURA INTEGRA 2D G2-M3 POWER MIRRORS BLUE LED ARROW 95 96 97 98 99 00, 98-05 LEXUS IS300 G2-M3 POWER MIRRORS BLUE ARROW LED SIGNAL LIGHT 99 00 01 02 03, 00-05 DODGE NEON G2 M3 MANUAL SIDE MIRROR BLUE/AMBER LED LIGHTS CLEAR LENS 01 02, 97-03 FORD F-150 F-250 G2 M3 POWER MIRRORS BLUE ARROW SIGNAL LED LIGHTS 98 99 00,