For a 3/4 ton try some 16" tubeless wheels off newer (than your) Chevy, ford, and Dodge trucks and vans.
I don't have a direct answer, but see what you find that fits over your brake drums and clears everything. Many of these wheels have similar looking centers to your original wheels, some even with hubcap clips if you find old enough ones.

•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-