On this parts fiche the Washer(10x15x1.5) is the most specified component.
The lowest price component in this Rear Master Cylinder (sv650ak7/sak7) parts-list fiche is the Pin.
This schematic depicts all components used in the Sv650s 2005 (k5) Usa (e03) Rear Master Cylinder (sv650ak7/sak7) partslist.