Parts such as the Rear Wheel (model J/k): Bolt(8x15), Washer, Washer, Adjuster,chain are included in the Lt230e 1993 (p) Rear Wheel (model J/k) parts fiche.
In this schematic the "Bolt" is used most often.
The Nut 8mm is the lowest priced item on this Rear Wheel (model J/k) schematic.