What bolt pattern does it have?
If it is the 7.25 circle with 5.25 hole I am surprised you found many wheels.
For that bolt pattern I have only found Accuride steel or aluminum wheels in 19.5", and Alcoa in Aluminum.
I seriously doubt someone makes an adapter to fit other wheels to that bolt pattern. At least none of the adapter manufactures did when I checked about a year ago. Please post some links if they do, I am curious now.

I thought the Budd wheel division had been bought by Accuride some time ago? And the Dayton wheel company (not the wire spoked wheels) thought Accuride had them too?

I thought

•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-