What size stock fans are available for use with stock fan clutches? My Challenger has an aftermarket aluminum radiator and a shroud from what I think was a 72 Charger. The fan I have only leaves about a quarter to 3/8" clearance on each side of the shroud and occasionally I hear the tink tink of blades on the shroud when the engine moves. I am not sure what the fan I have came off of, but I did have a New Yorker I parted out once as well as the aforementioned Charger that was parted.

Are there numerous sizes of fans and where would you go about buying one? Is the viscous fan kit a good option if I can find one? They seem to be out of stock everywhere...