The automotive industry has been eliminating the old style mechanical key and lock on new vehicles for years. You now see the same thing happening to motorcycles. Harley Davidson replaced the mechanical ignition lock and key on new 2018 Softail models with a key fob that provides security using radio signals to communicate with the motorcycle. The motorcycle's computer can communicate with the key fob and knows when the rider is carrying the correct fob. The ECU or computer can either disable or allow the motorcycle to start based on the key fob. If the rider shows up with the wrong key fob or no key fob at all, then the computer will disable the motorcycle.
In remembrance of the good ole days, I thought I would post a key blank application guide for Harley Davidson models. The lock/key industry does not give the motorcycle industry same attention it does to automotive, so some information may be incomplete. I don't think any of these keys will fit the Aermacchi model Harley Davidson's from the 1960's and 70's. You might need to do some extra research and ask questions to determine the correct key for your motorcycle. I included different manufacturer key blank numbers when it was appropriate.
| Harley Davidson Model | Year | Key Blanks |
| Dyna (FXD, FLD series models | 1991+ | HYD14, 1137B |
| FX Wide Glide (FXWG) | 1985-1986 | HYD12, X226 |
| FXR series (FXR Super Glide, FXLR Low Rider) | 1994 | HYD13, X234 |
| Softail (FXST series models) | Early 1984 | B1 |
| Softail (FLST, FXST series models) | Late 1984-1995 | HYD12, X226 |
| Softail (FLS, FXS series models) | 1996+ | HYD14, 1137B |
| Sportster (XL, XR series models) | 1994-2011 | HYD13, X234 |
| Sportster (XL, XR series models) ("B" code series) | 2012+ | HYD15 |
| Sportster (XL, XR series models) ("A" code series) | 2012+ | HYD16 |
| Sportster (XL, XR series models) ("D" code series) | 2012+ | HYD17 |
| Sportster (XL, XR series models) ("C" code series) | 2012+ | HYD18 |
| Street 500, Street 750 (XG500, XG750) | 2015+ | HYD19 |
| Touring (FL series - all models) | 1941-1979 | B1 |
| Touring (FL series - All Electra Glide models) | 1980-1982 | B1 |
| Touring (FL series - Some Tour Glide models) | 1980-1982 | B1 |
| Touring (FL series - Some Tour Glide models) | 1980-1982 | X133-X136, X141, X142 |
| Touring (FL series - Some models) | 1983-1984 | B1 |
| Touring (FL series - Some models) | 1983-1984 | X133-X136, X141, X142 |
| Touring (FL series) | 1985-1992 | X133-X136, X141, X142 |
| Touring (FL series) | 1993+ | HYD14, 1137B |
| Trike 3-wheeler | 2009+ | HYD14, 1137B |
| V-Rod (VRSC series models) | 2002+ | HYD14, 1137B |
