Clutch fan question

Did you have to use a spacer? If so which one? Mine did not have a spacer just 7 blade aluminum fan and fan clutch bolted directly to front of water pump pulley

No, I didn't use a spacer. Space it pretty tight in mine with the Champion radiator. I couldn't even fit the standard 2765 hd clutch on it. You shouldn't need a spacer when using a clutch fan. How much room do you have between the waterpump and radiator? How big is the fan opening in the shroud?