Tech Tip
http://www.stovebolt.com/techtips/wheels/

If you want 20" or 22.5" wheels they are very common used. I can think of about a half dozen sets of 6 lug 22.5's I've seen in various yards within a hour and a half of here.
If I were you I'd go ahead and find a set of 22.5" wheels.

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-