Parts such as the Rear Cushion Lever: Seal,rr Cushion Lever Ctr Dust, Washer, Bearing(17x24x25), Nut 12mm are included in the Sp600 1985 (f) Usa (e03) Rear Cushion Lever parts fiche.
In this schematic the "Washer" is used most often.
The fourteen Sp600 1985 (f) Usa (e03) Rear Cushion Lever component parts are all listed in this schematic.