On this parts fiche the Spoke Set,b is the most specified component.
The Washer,plain, 6mm is the lowest priced item on this Rear Wheel schematic.
Parts such as the Rear Wheel: Washer,spring,6mm, Spoke Set B, Tire,250-17 Nt-86, Collar are included in the C90z Cub 1992 (n) Mexico / Kph Ms Ss Rear Wheel parts fiche.