Right, compare the wheel mounting surfaces, and confirm that the backing plates are in the neighborhood and fit outside the springs, usually not a problem.

If the wheel mounting surface measurement is off, consider what wheels you will use, might be you can still make it work with the right wheels.

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-