The most reasonably priced component used on the Xs850 1980 (a) Usa Front Brake - Caliper is the Ybs67-10 Washer, Spring.
Parts such as the Front Brake - Caliper: Brake Pad Kit (mca), Sleeve, Caliper Support, Bleed Screw Kit, Disk, Rear Brake are included in the Xs850 1980 (a) Usa Front Brake - Caliper parts fiche.
This Caliper Asy Lh is the most expensive of the items that make up this Front Brake - Caliper assembly.