The Nut,6m/m is the lowest priced item on this Starter Motor schematic.
On this parts fiche the Washer, Thrust, 0.2t is the most specified component.
Parts such as the Starter Motor: Washer,9.1x18x0.8, Ring-o,starter Motor, Nut,6m/m, Washer,6mm are included in the Jh750-c3 Jetski750zx 1997 Usa Canada Starter Motor parts fiche.