The only aluminum wheels I know of are Alcoa or Accuride 19.5" wheels for use on a Chevy 3500HD or P30 chassis with that same bolt pattern. They can be bought new.

I have never seen 20 or 22.5" aluminum wheels with that bolt pattern.

Grigg


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-