Part number (see attachment).
47 to 51 = Pull down door handles.
52 to 55 1st = Push button door handles also door latch changed
47 to 50 = One piece window
51 to 55 1st = Vent window

51 doors in good shape are harder to find...fewer made

No repops
Attachments
Parts List Door.jpg (24.01 KB, 79 downloads)

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."