HD-OEM: 37550-84Part Number: 18-8170 UOM: 1 - EA Summary:Clutch hub is constructed of aluminum with a steel center. The stud towers are aluminum.Fitment: FXST 1985-1990 FLST 1986-1990 FLT 1985-1990 FXR 1985-1990 Country of Origin: Imported