Hello MattD,
I checked to see what I might have.....
I have a 4 blade spot welded type... 15 3/4 in., which I believe came off my '37 MD. (swapped it out for a truck type, hoping it would help pull more air thru the radiator)
I have a 4 blade that is a riveted type ... it is 15 7/8 in. (I have a back up 216 engine that came out of a '37 MD. that it is attached to. I haven't checked the numbers on the engine to see what year it is.)
neither has a part number. You may want to move this post to the "Parts Wanted Section", you may get a better response.
Good Luck
Guess I should have looked a little further, seems you already did that and scored..... congrats.
Last edited by dfd37chev; 07/29/19 05:10 PM. Reason: add a little more detail