No room!

This looks like it might be the one, but it does not appear to be readily available.

Nonetheless original/subsequent part numbers and application info should provide you some leads to scare a used unit up out of the salvage yards.

NOS Mopar Fan Clutch 1964 Thru 1969 Car & Truck - Hiltop Auto Parts

Fan Clutch 2536675 | PartsMarket