The most expensive part in this assembly is the Cylinder-assy-master,.
On this parts fiche the Washer,10.5x15x1.5 is the most specified component.
Parts such as the Rear Master Cylinder: Piston-comp-brake,rr, Stopper-brake,dust Co, Cylinder-assy-master,, Diaphragm,master Cyli are included in the Kz1300a3 1981 Usa Canada Rear Master Cylinder parts fiche.