The Washer,10.5x15x1.5 is the lowest priced item on this Front Master Cylinder schematic.
Parts such as the Front Master Cylinder: Hose-brake,fr,upp, Plate-diaphragm, Stopper-brake,piston, Washer,10.5x15x1.5 are included in the Zx1100g3 Zzr1100 1999 Fg Front Master Cylinder parts fiche.
The Front Master Cylinder is made up of components including this Cylinder-assy-master, which is the most expensive.