The Bolt,hex 6x12 is the cheapest item from this partsfiche.
On this parts fiche the Bolt,flange,8x32 is the most specified component.
Parts such as the Final Driven Gear: Nut,axle,14mm, Collar,axle Dist., Shim C, Ring Gear, Shim A, Ring Gear are included in the Cx500c Custom 1981 (b) Germany / 27ps Final Driven Gear parts fiche.