Fits FL & FX 4 speed Late 1978/1984 (except Softail). Made by Accel. Ready to install, OE fit wire sets. 8mm thick wires provide the ultimate in spark plug wire performance for street or racetrack use. Extra thick silicone jacket covers strong fiberglass braid that covers another layer of premium silicone. All of this covers our high capacity conductors in either stainless steel silver plated copper combination, which improves electrical conductivity and mechanical strength, or graphite RFI suppression for use on Harleys® with electronic ignition to prevent damage to the control modules. High strength dielectric silicone spark plug boots provide excellent insulation, preventing arcing to the cylinder heads.