Front bumper and valance (sheet metal behind the bumper) is different on 75 and older, and the 74 and older have different tail lights and tailgate setup. The front fenders on the 75 and older rigs might have some slight difference where they hook to the valance, but I think they'd still work. Other than that, parts should swap right across to an 80. If you want wing windows, 77 and older doors have them, 78 and newer do not. Stick with the 78 and newer for doors if you don't want the wings, the window parts might swap since the outer sheet metal is the same, but it would not be worth the effort.
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