The Screw is the lowest priced item on this Clutch Master Cylinder schematic.
Parts such as the Clutch Master Cylinder: Hose,clutch, Clamp, Union, Clamp are included in the Gsx650f 2008 (k8) Usa (e03) Clutch Master Cylinder parts fiche.
With four applications this Washer(10x15x1.5) is the most specified part.