If all you want are original 20" wheels just look for and find some, lots of them out there.

I sold a great set really cheap a couple months ago, they are out there if you look, may take some effort finding and hauling them but I'm sure they can be found cheaper than reinventing the wheel (pun intended)

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-