I was able to get one retaining bolt at NAPA after stripping a new one. I’m not sure if they were doing me a favor or if they have a part number for just the bolt.

When installing line up the spring pin best you can then set the lock bolt with a hammer and punch. Nut and lock washer are to keep it from falling out, the pin is soft and likely to strip if using nut to draw it into place.

•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-