47-50 had no vent window and the same striker/latch/catch, with a turn-down outside door handle

51 was an oddity - vent window and the rest matching 47-50

52-55st had vent window and a different striker/latch/catch, with a push-button fixed (non turn-down) outside door handle

Any year door could be used on any year cab, as long as you used the door-year matching striker/latch/catch