On this parts fiche the Bolt Socket is the most specified component.
Parts such as the Front Fender: Fender Comp*r157*, Reflector,fr,rflx, Bolt Socket, Nut,flange,5mm are included in the Nt650 Hawk Gt 1989 (k) Usa California Front Fender parts fiche.
Of all the components used in this assembly the Fender Comp*r157* is the most expensive.