The sheet metal items are interchangeable, between the 60-'63 Chevy and GMC trucks, with the exception of the dash board for the Chevy, is different from the GMC, but will interchange. The '60-'62 truck frames are wider, than the '63-'66 truck frames, so the mounting locations of the front & rear frame-to-cab supports do not line up. Although the windshield/A-pillar changed in 1964, the frame style changed in 1963.
