I have a 67 RS 327/210 HP which currently has a flex fan installed. A clutch fan was provided when I purchased the car an I am trying to identify if it was the original clutch fan. The only numbers are "L0172SC" stamped on two places of the fan to pulley flange, an "M" or "W" stamped on one fan blade to center hub and a "4" stamped on one of the fan blades. See pictures. Any help identifying this clutch fan is appreciated.