In this schematic the "Damper" is used most often.
A sample from the products for the Seat include: Damper,10x20x12, Washer,6x20x1.6, Seat-assy,black, Collar,6.5x20x16.8.
The most reasonably priced component used on the Zx1000yhf Ninja H2r 2017 Europe Seat is the Washer,6x20x1.6.