I would like to know what the diameter is of a stock 340 clutch fan. My car has a Mopar Performance viscous clutch fan kit on it but did not have a fan shroud when I got it. I bought an original 22" fan shroud to put on the car only to find out the fan will hit the shroud at the top. The MP fan looks to measure about 17 1/2 to 18" in diameter. Were the stock fans a little smaller?