From Unofficial Zero Manual
The design and fitment changed from MY 2013-2014 to MY 2015+, when the forks changed from FastAce to Showa.
- Upper Assembly
- This sits atop the steering head, joining the forks at the top, and supports the handlebars, ignition switch, dash, and headlamp.
- Lower Assembly
- This inserts upward through the steering head tube, joining the forks below the tube, and supports the headlamp bracket and the high fender for DS/DSR/FX models.
The upper assembly and lower assembly join around/through the steering head.