The stock radio should be a standard DIN sized unit, which should fit most aftermarket radios. The slots on the bottom edges of the unit are keyholes for inserting removal keys.

I'm unfamiliar with the sound setup on your car, you might want to contact a stereo shop for more information on how the speakers and amps are wired. Scott w/ La Jolla Audio frequents this board and should be able to help answer questions.

-anthony