Just bought a car, speaker problems

i just bought a 94 formula, and it seems like the passanger door speaker is blown. it rattles badly when the radio is loud at all, but it seems like its mostly the base. i see there are two speakers in the door, which one is it? should i replace both? would this replace the main door speaker? http://cgi.ebay.com/ebaymotors/96-97-98-99-00-01-02-CHEVROLET-CAMARO-RH-DOOR-SPEAKER_W0QQitemZ120130230243QQihZ002QQcategoryZ38 646QQrdZ1QQssPageNameZWD1VQQcmdZViewItemQQ_trksidZ p1638Q2em118Q2el1247 or is it only for camaros. and is this probably the problem? the car has a sub and amp in it from the previous owner, but it seems like this is the only problem. would replacing the speaker be the right thing? any help would be great. thanks

Your components are separately mounted, where the Camaro has coaxially mounted components. You do not want the speaker linked above.

ok, thanks. i dont really know what to do, i think its going to circuit city because i have no clue how to setup or control the amps and sub, i dont get any of it. so i think im just gonna see what they can do, i have the reciepts and thats where he got the work done anyways

seems like the whole system is blown, anybody know where i could get some factory speakers? for cheap? or a cheap setup thats better? thanks