I talked to the seller of the truck on Ebay.
Yes they are 22.5" with the 10 lug on 7.25" diameter.

I also talked to Bob Adler, he has some of the same wheels and says they were available starting in 56, don't know till when?

Now I just need to find a set.

•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-