Nope, not that I know of because the front cab mounts are about at the rear of the springs and that's essentially or exactly the same width for all sizes of AD trucks.

Perhaps they're used in about a 4 or 5 ton GMC; just smaller than the "fat cab" models? Haven't seem them used in 1/2 -> 3 ton trucks, not sure about larger.

My cab mounts on the frame also have holes, it all lines up and it'd be no problem to use them if I wanted to.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-