The eleven Tu250x 2011 (l1) Usa (e03) Seat component parts are all listed in this schematic.
The Washer(6.5x18x1.6) is the lowest priced item on this Seat schematic.
Parts such as the Seat: Cushion,seat(40x20x15), Seat Assy,pillion, Seat Assy, Nut are included in the Tu250x 2011 (l1) Usa (e03) Seat parts fiche.