The door speakers front and rear are 6x8's. I have Polk Audio EX368's in mine front and rear with an Alpine CDM-7874 head. Sounds awesome! Of course I just listen to REAL music, not all that boompa-boompa noise.
8 or 10 inch woofers, IMO, would not fit. There's just not enough room.

'99 Sport TropicGreen,Duratec, SVT exhaust, Brembo rotors, Ceramic pads, K&N filters(oil & air), Alpine CDM7874, Polk DB570 speakers front and rear. Fog light mod. 50% Formula One tint.