I agree that a 7.50-17 should fit your rim but you should also confirm with the recommend rim width for your chosen tire.
Your rim is not 7” wide, it has that wide a tire on it now. The rim is more like 5” or so, measure inside the bead seat to find out.

•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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