The Washer, Plate(481) is the most widely applied product in the XS850 1981 (B) USA FRONT MASTER CYLINDER ( eleven times ).
This schematic depicts all components used in the Xs850 1981 (b) Usa Front Master Cylinder partslist.
The most reasonably priced component used on the Xs850 1981 (b) Usa Front Master Cylinder is the Bolt(30w).