I just picked up the flat steel military looking kind (original GM accessory) for my 2 ton, complete with instructions and drilling template.
Can take some pictures if that helps give you ideas, won't fit a 3/4 ton though.

What kind do you have?

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-