Bought a 6632B that was missing the fan and PCB spacer. Luckily I had another one, since the fan is not called out separately and there a spacer between the fan and heatsink cut out of blank PCB.
So the fan is a EPM-PAPST 612NGHH 60x60x25 33CFM It is held in place with 2X M3X10 screws
Drawings of the spacer, photos and datasheet are attached.