The exact fitment for Harley-Davidson part number 31800-99ZA covers a specific window of legacy models:
- 1984–1999 Harley-Davidson Softail models (such as the FXST, FXSTC, FLST, FLSTF, and FLSTC).
- 1965–1984 Harley Big Twin 4-Speed models (including Shovelhead platforms like Electra Glide, Super Glide, Wide Glide, and Low Rider) configured with traditional 12-volt square-style OE ignition coils.
Key Fitment Notes
- Placement: It mounts strictly on the left side of the motorcycle where the stock coil bracket sits.
- Engine Type: This is primarily designed for Evolution (Evo) and Shovelhead engines. It will not fit newer Twin Cam, Milwaukee-Eight (M8), or Sportster models that utilize completely different cylinder configurations, electronic fuel injection (EFI) setups, or rounded plug-and-play coil packs.
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