I have a 48 cab with 48 doors (original)
Plan to use 52 door handles on it because I like them, need to weld in the proper reinforcing plate from the 52 and change a few holes in the door skin. Also using aftermarket latches in the swap. Not sure if later model latches fit the older doors (with exception of outside handles) I'd guess they do?

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-