Per our 1948 4door hulk, the upper hinge bolts to the door and body, and is a hidden design unlike anything else. The lower hinge rivets/welds to the door and is bolted to the body. The lower hinge is functionally the same as the 1935-40 lower hinge but likely has a different bolt pattern (we reproduce individual pieces in bronze, Drake/Carpenter sell a full 1937-40 set in steel). If you can possibly salvage the lower hinge do so without removing from the body, they are difficult to remove and a new mounting structure has to be fabbed as the original hinges were installed as an early step in the door manufacture.