A sample from the products for the Rear Master Cylinder (sv650k3) include: Piston/cup Set, Boot, Nut, Washer(10x15x1.5).
On this parts fiche the Washer(10x15x1.5) is the most specified component.
The twenty-eight Sv650a 2004 (k4) Usa (e03) Rear Master Cylinder (sv650k3) component parts are all listed in this schematic.