I just went to Best Buy and Circuit City and asked them the question before I got any replies and both of them said that it takes 6.5 in front and rear. Sheesh well you guys have the car too so I guess I'm now looking for 5 1/4 and 4.
Circuit City is wrong, there is no way to fit 6-1/2's in the rear doors. They can go in the front but you'll need spacers, and not all 6-1/2's will fit because of clearance issues. The window is behind the speaker when it's down, and the grille is an issue in front.
I got polk db650 and db400 decent speakers if your on a budget. The 650's sound great, but the 400's being 4" speakers sound like 4" speakers. I have a rattle in the front drivers door, but can't blame the speaker for that. Overall great sound. I had prof. install so I dont know if they had any trouble installing, but both were under 2" deep.
you can use the stock wiring, bur leave some wire on the factory harness if you want to splice it bak, second in the front doors with components, make your splice from factory to aftermarket at the tweeter connection, it makes you life a whole lot easier. i have infinity from best buy, they work great, make sure you use a 4 channel amp, with a built in cross over, eveything goes together real easy this way, but still you the componenet cross over also. and do not be cheap either use dynamat, you will like the results. also these speakers worked well with 1/2 inch spacers from best buy.