fan clutch

Good morning, im putting together a 71 340 and have the 18" fan 2863216 and would like a OEM style clutch for it, can someone recommend a clutch for my fan. I like Tonys repro clutch 070 but dont want to spend that kind of money.
Can i get one from Napa or Rockauto ? part number? it has to be non-thermal and "heavy duty". Any help is of course appreciated..Rich