not sure on your bracket question... I do know the front ones are left and right handed. For sure they need to be from another AD truck. look in the parts book to see if 1.5and 2 ton brackets are the same as the 1 ton and smaller.

Running boards should come from a 1/2, 3/4, or 1 ton, the big truck running boards are different.

•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-