I used an off the shelf hitch on my 1 ton, wish I knew what it was supposed to fit... only had to drill the mounting holes in the bottom of the frame. Hitch was already the right width for the 36" frame.

Take your measurements and go somewhere that has a lot of hitches in stock, you may also get lucky.

•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-