Rear Chain Drive Conversion Kit For Harley-Davidson Sportster. Transmission sprocket conversion kit is uséd to convert belt drive models to chain drive. Kit includes 23 tooth front sprocket and 51 tooth rear sprocket with special nut to accept sprocket and a chain breaker tool. The metal spacer features a 2.1 inner diameter. Chain must be cut to correct length. Sorry, our items are NOT available for pick-up. Paying via Direct Deposit. No additional information at this time. You might also like. S&S Cycle 48-99 BT Tappet Guide Front Gasket. S&S Cycle Backplate Gasket For Models w/ Stock CV Carburetors & Cable-Opperated. S&S Cycle Super E Carb Manifold to Carb/Throttle Body O-Ring. S&S Cycle Super E/G & CV Adapter Backplate Gasket.