They're out there the trouble is finding them. That medium sized GM 10 lug pattern is not nearly as common as other choices and being only on some years and model range of GM trucks and not any other makes increases the difficulty of finding them used.

•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-