From 75 - 79 very little changed and the changes were minor. So most parts will interchange. The dash changed in 77 so non of that will work in the 75, but the 69 - 74 will. Grill for the 75 was a one year only and had several variations and 2 different colors of park lamps. All the sheet metal will work, all the mechanical stuff. In 77 the AC unit changed, the entire units will bolt in but the system parts are different.