60's Chevy Gmc interchangeable parts

[Badkarmav11]

New member, thanks for any feedback in advance. I am in the process of replacing the front clip on a 1965 GMC 1000. Rust was a large issue with many of the original parts. My question is what is the difference with a Chevy radiator core support vs. a GMC core support, same question applies to the grill support? Or is it possible to use the Chevy support on a 65 GMC? And what if any modifications does it take? I am trying to source all parts from one supplier.... LMC, American Classic...etc