The all might Viscous fan

The the clutch fan in my car is a thermostatic unit that I got at the local parts store for about $40 and the fan was one I grabbed from the bone yard for a couple of bucks. It was from a GM product, I think it was a mid 80's Regal.

The hub the fan mounts to is pretty universal between Mopar , GM and Ford. If you go the bone yard route just make sure its not a reverse rotation unit.