Difference between core support in 57 GMC and 57 Chevy

[Old57]

Originally Posted by OldChevysRule

I have both frames. What measurements are you needing?

That'd be great if you could get me some measurements, if it's not too much trouble. If I could get a measurement between the front cab mount center of holes to the GMC core support mount center of holes, a measurement between the front cab mount center of holes to the Chevy core support center of holes, and a measurement of how much lower the GMC core support mount is from the Chevy core support mounts. Thanks a lot!