Part Number: 18-8307 UOM: 1 - EA Summary:Clutch drum starter ring gear is 66 tooth bolt-on type. Replacement ring gear has an inner diameter of 6-3/8" for stock clutch drums. Bolt-on ring gear includes screws. Fitment: FXST 1991-1993 FLST 1991-1993 FLT 1991-1993 FXR 1991-1993 FXD 1991-1993 Tech. Notes:THE I.D. of the ring gear is 6 3/8" .Country of Origin: Imported