Keep in mind, the '60-'63 Chevy/GMC truck cabs, are different than the 4-5-6 Chevy/GMC truck cabs, so the doors & dash components will be different. Also, the '60-'62 frames are a different width that the '63-'66 cabs, so you will need to do some modifications to the supports, where the bolts drop through the floor and into the frame-to-cab perches.
