[DavidG]

According to the Body Parts Catalogs, the rear door bumpers on the rear door lock pillars of convertible sedans changed with the '37 models. There were two different bumpers, 48-702610 and 78-702610. If you know your Ford part numbers, you will note that those basic part numbers are for the 700 body type, namely the Tudor sedan. (The 78-prefix bumpers were used on nearly all of the '37-39 passenger cars and as a result are widely available in reproduction form as are the 48-prefix bumpers.) There was an A and B suffix of each reflecting different widths (thickness) for different fitting doors. Usually only the B or thick version is reproduced and they may require trimming for a specific door fit. There's no mention of the use of Model A body parts on '37-'39 convertible sedans or any other body type.