The most expensive part in this assembly is the Headlamp Assy.
On this parts fiche the Screw is the most specified component.
This schematic depicts all components used in the Gsxr750x 1986 (g) (e01 E02 E04 15 16 17 18 21 22 24 25 34 39 53) Headlamp (e18,e34) partslist.