Am curious if your car has a special rear end. The 53 Caribbean is on the 2631 chassis and if stock, the drum would be used on several 48-50 and 53-54 models. If stock, I believe your rear drum and hub part number would be 351423
The 433197 part number you gave is for a 51-54 commercial chassis -- mostly ambulances and hearses. I believe one other poster has a commercial rear end on a convertible but not sure the reason.
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