On this parts fiche the Washer, Plate(481) is the most specified component.
A sample from the products for the Rear Master Cylinder include: Cylinder Kit, Master, Bush,diaphragm, Bolt, Button, Pedal, Brake.
This schematic depicts all components used in the Fjr1300 2002 5jw4 Holland 1a5jw-300e2 Rear Master Cylinder partslist.