Parts such as the Seat: Cover, Double Seat, Nut(661), Lid, Bracket, Seat Lever 1 are included in the Xs850s 1980 (a) Usa Seat parts fiche.
With a quantity of six pieces, the Pad, Seat is the most used part in the SEAT diagram.
The Washer(6a1) is the cheapest item from this partsfiche.