Difference between core support in 57 GMC and 57 Chevy

[Old57]

I have been searching for something to show the dimensions of the difference between the way the core support mounts on a 57 GMC and a 57 Chevy. The GMC is totally different and mounts lower and to the center of a crossmember, and the Chevy mounts on both sides of the frame rails. I have a GMC core support that I want to modify to mount like the Chevy version. Does anyone have anything that shows the dimension differences, or have both frames that could take measurements and let me know?

[ChuckDriver]

I cant give dimensions, but here are two photo's for comparison.

[Old57]

Thanks for the pics

[OldChevysRule]

I have both frames. What measurements are you needing?

[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!