with out knowing the year it would be hard to tell you . what I can tell you is this.
Look at the face of the existing radio. if it is about 2 and 1/2 inches high then it would be a single din radio. if it is larger then you will need to get a double din radio or a face plate kit.
the path to a great sound systems always starts with the head unit. because your amp and speakers will only play what is sent ot them. for this reason you will want to ask about distortion level.. most high end stereo shops have a radio deck. this allows them to punch a button and quickly show you the radio ---amp-- and speaker combo your are inquiring about.. this makes it easy to remove the amp from the loop. and just hear the radio by itself.. once he has this ready then turn up the volume. listen for the point where the sound quality starts to distort, or simply ask him to show you the specs for the radio and compare.
my personal favorite is the Kenwood Excelon series. these radio's offer top notch sound.
