On this parts fiche the Washer,10.5x15x1.5 is the most specified component.
This Rear Master Cylinder diagram displays the required parts for the Zx1000a1 Gpz1000rx 1986 Europe Fr Uk Fg Gr It Nr Sd Sp St Rear Master Cylinder.
A sample from the products for the Rear Master Cylinder include: Joint, Hose-brake,rr, Washer,10.5x15x1.5, Diaphragm.