On this parts fiche the Spring-brush is the most specified component.
Parts such as the Starter Motor: Bolt-socket,5x10, Bolt,socket,8x16, Switch, Nut,6mm are included in the Zx1002hkf Ninja Zx-10r Se 2019 Europe,middle East,africa Starter Motor parts fiche.
The Bolt-socket,5x10 is the lowest priced item on this Starter Motor schematic.