On this parts fiche the Nut(661) is the most specified component.
The sub assemblies and components that make up this Seat include this Double Seat Assy, the most expensive part.
Parts such as the Seat: Double Seat Assy, Stopper Main Stand, Bracket, Seat Lever, Seat Lock Assy are included in the Xj650 Maxim 1980 (a) Usa Seat parts fiche.