The sub assemblies and components that make up this Handle Switch include this Switch Assy, Handle Lh, the most expensive part.
On this parts fiche the Screw, 5x45 is the most specified component.
The most reasonably priced component used on the Gsxr1100 1988 (j) (e02 E04 E06 15 16 17 18 21 22 24 25 34 39 53) Handle Switch is the Nut.