Twin Power 65-79 Big Twin and XL Ignition Coil Black Replaces H-D 31609-65A 5 OhmTwin Power coils are high quality direct fit with at least 20% more voltage than stock. Our 12 Volt high performance coil features special heat resistant construction. These high voltage replacement style coils deliver 35,000 Volts and are designed to handle the high RPMs you throw at them This Part Fits: Year Make Model Submodel 1971 1978 Harley Davidson FX Super Glide Base 1974 1979 Harley Davidson FXE Super Glide Base 1979 Harley Davidson FXEF Fat