6.5" in the front, and 6X9" in the rear. Well, that's what my car had anyway... FYI There are inconsistencies in different manufacturers.
6 inch
5.25 inch speaker
no
6 1/2 - 6 3/4 for the front doors and 6x9 for the rear deck
5x7
6x9
6
4x6"
6x8
6 3/4
6x9
6 3/8"