Try this thread and the tech tip link contained within.
https://www.stovebolt.com/ubbthread...els-and-tires-what-to-do.html#Post867617

More modern 19.5” wheels like from a P30 Chassis or 3500HD, all with 10 lugs like yours is probably your best bet. Check that they fit over your brakes before buying.

Are the originals 18”?

•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-