HD-OEM: 37871-84Part Number: 18-3213 UOM: 1 - EA Summary:Barnett heavy duty diaphragm clutch spring is 10 percent stiffer than the stock spring. Spring is .0870" thick. Clutch spring has a .0870" thickness.Fitment: FXST 1985-1990 FLST 1986-1990 FLT 1985-1990 FXR 1985-1990 Country of Origin: USA