The B-76600, 76601, 76602, and 76603 hinges are unique, not carried over from Model A and not used on any other '32 body type. One reason for that is that unlike all other body types, including the closed cab bodies, the hinges mount on the outside surface of the cowl-side door opening, as shown in the photo below.
Another likely reason is the hinges' placement on the door and cowl. For example, while the bottom hinge on a phaeton/roadster door appears to be in about the same location vertically as that on a open cab, the upper hinge is located below that of an open cab. Without modification to account for the different placements vertically, the doors would not operate properly.