okay the best way to find out is look at the side of the car. ^641/2 thru 66 has the same quarters were as the 67 has two vents as well as the 68. ,69 it totally differnt from the previous years, the only differnce in 69 and 70 is the front end 69 has 4 head lights the 70 has 2 with vents. 71 thru 73 are the big ones
Also look on the home page there is a section with pics from those years that will tell you