I do have the factory assembly manual and checked the "K02" option, it does show part numbers but not "dimensions". Most of the 5-blade fans on eBay seem to not have an original part number...just and "H" or "W" on them and marked "front". I am trying to figure out the difference that CRG calls out with the 3" or 3.25" on the fans.
I also see fan clutches on eBay with the part number 3916141 and they claim they are for 68 small block 327 or 350. Wondering if these will work? I don't care if the part number is correct so much. My car is not totally original anyway.