I've never done this but I've seen Mark's truck and he claims the late doors on it are from adding later ('53) doors and striker plates .
FWIW , don't use the repop striker plates in the early trucks ! they wear rapildy even when properly adjusted , I bought a set of N.O.S. GM ones on E-pay and then made some shims by cutting up the failed repop striker plates to shim the strikers closer to the latch for proper engaugement ~ if you look as the door closes , the latch usually barely enters the striker , a result of poor quality control in the body jigs when your truck was originally built . you _DON'T_ want to doors flying open so careful shimming and adjusting of the striker is smart to do ! my doors now open and close smooth like a Buick ~ NO slamming needed .
-Nate