Fan clutch needed

Good morning to all
I am looking for a new fan clutch for our 70 340 engine.Have gone through 3 major chain parts stores here(Calgary area) and on line with some others to no avail. The old clutch appears to be original or maybe changed out at some point. I am looking for what appears to be a short shaft out of the clutch itself for a total height of 2.250" any longer and I am in the rad.The clutch case OD is 6.0". Standard rotation and non thermal. Are they any other manufactures outside of the Four Seasons Inc (4s.com) that I may check or numbers that I can cross reference. Trying to stay away from an online order if possible. Any info greatly appreciated.Thanks