Http://www.crutchfield.com will tell you what will fit. Off the top of my head I know that Infinity makes drop in replacements. And I think Alpine has some that will fit with adapter plates from crutchfield
Let us know what you decide on. I want to replace my stock speakers this summer
5x7 or 6x8 will fit in our cars. Umm as far as it goes i replaced my speakers with a 5x7 Alpine type r' component and 5x7 (regular) set in the rear followed by a JL Audio 450/4 amp. As far as 6x9 goes.. they most likely wont fit in the door panel. However, as far as the rear deck is concerned im sure if you took a dremel you could do that. THe only thing that concerns me is the amps under the rear deck..
my stock amps are gone, they where gone b4 i bought the car, im guessing the stock speakers are plugged into the aftermarket deck. im going to get 5x7s for the doors and 6x9s for the rear, ill make them fit...thanx guyz