The design eliminates the need for spark plug wires by mounting the coils directly to the spark plugs The cast aluminum cover holds the coil and acts as a functional heat sink to move heat away from the cylinder head All cables are hidden in the slats of the head for a clean and wireless appearance Suitable for the following Harley models: Softail Heritage Springer EFI FLSTSI Softail Springer EFI FXSTSI Softail Night Train EFI FXSTBI Softail Heritage Classic EFI FLSTCI 15th Anniversary Fat Boy FLSTF Softail Springer Classic EFI FLSTSCI Super Glide Custom EFI FXDCI Electra Glide Standard EFI FLHTI Electra Glide Classic EFI FLHTCI Electra Glide Ultra Classic EFI FLHTCUI Tri Glide Ultra Classic FLHTCUTG Electra Glide Ultra Limited FLHTK Electra Glide Ultra Classic Low FLHTCUL Electra Glide U.