Clutch fan sizes, part numbers, etc.

Hi guys,

Does anyone know the correct part number, size, etc., for the clutch fan that originally came on the 1975-76 Dart 360 Sports? The wife and I both have '75 Darts, hers is a 340, mine is a 360, both currently have fixed fans, no shrouds. I have a friend close by who gave me what he thought was the right one, though neither of us knew for sure, but its part number is 3462186 which is a 20" 7 blade, which I found fits B, C, F, and R bodies, at least according to a few eBay ads. I *THINK* the A bodies had a 17 or 18 inch fan, right? I can't seem to find a definite part number.

If the shaft is short enough to fit between the water pump and radiator, is there a downside to using a 20" fan? Her radiator is currently a 22", mine's a 26". I'll be building shrouds to fit whatever fans will work. My buddy has several other fans lying about but I didn't inspect what he had, just took the first one he put in the bed of my truck when I picked up some other parts yesterday.

Editing to add: both will eventually have the air conditioning restored.

As always, we appreciate your input!