crutchfield.com has an easy fit guide that will tell you what the speaker sizes and HU opening size is. Compare their guide to your inspection of the speaker to be sure. They are quite accurate but I have seen some discrepancies in their measurements.
according to crutchfiled you would need 6 3/4" in the front door and rear deck, you could use most 6 1/2s thought bc a lot of them are ment to fit many near sizes