22.5" 6 lug Budd wheels are not "Unicorns" in my experience. If you want them you can find them, I have bought and sold a few sets myself.

I'd think hard about swapping an 8 lug (on 6.5"?) rear axle under a big truck. Might want something rated close to the original axle.

•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-