Can someone measure the rear cab mount on a 73-80 K10?

[kkgp81]

I am converting a C10 frame to K10 and looking at pics of my old frame that I sold long before I got this frame to convert it looks like the rear cab mount is below the frame rail a smidge where the C10 mount is even with it. It looks like about 1.5-2" difference. I may have to custom cut a rear mount as currently using C10 mounts it sets the cab on a 4L60 transmission.

ETA yes cab has a high hump as its an 86/87 stripped K10 cab.


Actual K10 frame

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C10 conversion frame

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[straydog371]

Maybe these pictures will help?
1978 K10 Scottsdale
Early stages of bringing her back to life...