Twin Power 65-79 Big Twin and XL Ignition Coil Black Replaces H-D 31609-65A 5 OhmTwin Power coils are the high quality direct fit with at least 20% more voltage than stock. Constructed from durable high quality, molded epoxy, in a late O. E. M. style molded case, these ignition coils improve starting, prevent high speed misfires and increase overall performance. They are available in black and chrome, and come with a one year manufacturer's warranty. This Part Fits: Year Make Model Submodel 1971 1978 Harley Davidson FX Super Glide