The Washer-seal,10.1x14.5 is the most widely applied product in the ZX1000SJFA NINJA ZX-10R 2018 EUROPE,MIDDLE EAST,AFRICA REAR MASTER CYLINDER ( four times ).
The component with the lowest price in the REAR MASTER CYLINDER schematic is the Bolt-flanged,6x16.
The Rear Master Cylinder is made up of components including this Cylinder-assy-master, which is the most expensive.