Mike, the Accuride part number 28160 he gave is the 22.5" wheel.
http://www.accuridewheels.com/completeversion.pdf
look on page 12

If you're finding that they are now obsolete keep looking and calling around because they were available quite recently and someone may still have some in stock.

Also check http://www.wheelsnowinc.com/ they have a huge selection of stuff in stock.

They are not uncommon in junk yards, it'll take some searching but I have no doubt that you can find some used ones at a reasonable price.

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-