On this parts fiche the Bolt, Washer Based is the most specified component.
A sample from the products for the 01 Cylinder Head include: Clip, Reed Valve Assy, Washer, Plate, Rubber, Mount 1.
thirty-six components are shown in this Yzf-r3a 2015 B023 Europe 1pb02-300e1 01 Cylinder Head exploded diagram.