Alrighty thanks, because im going up to a junk yard this weekend and didnt want to buy a cab that would fit!
4-5-6 Chevy 1/2 ton cabs are a direct bolt-on to a '66 1/2 ton frame...'60-'63 1/2 ton cabs will work, however there are modifications required to line up the frame mounts. C20 cabs and frames have different rear cab mounts and require modification to the mounts, in order to bolt up.