The Washer(6a1) is the lowest priced item on this Shift Cam - Fork schematic.
This Shift Cam - Fork diagram displays the required parts for the Xs850 1980 (a) Usa Shift Cam - Fork.
Parts such as the Shift Cam - Fork: Washer, Plate (353), Washer(6a1), Shift Shaft Assy, Circlip are included in the Xs850 1980 (a) Usa Shift Cam - Fork parts fiche.