The most expensive part in this assembly is the Double Seat Assy.
Parts such as the Seat: Helmet Hanger Assy, Cover, Double Seat, Double Seat Assy, Ybs67-8 Washer, Spring are included in the Xs400 1982 Maxim Usa Seat parts fiche.
This schematic depicts all components used in the Xs400 1982 Maxim Usa Seat partslist.