The Screw is the lowest priced item on this Electrical schematic.
Parts such as the Electrical: Spacer, Screw, Washer,lock, Spacer(6.5x10.5x40) are included in the Gsxr1100 1987 (h) (e01 E02 4 6 15 16 17 18 21 22 24 25 34 39 53) Electrical parts fiche.
With four applications this Cap,spark Plug is the most specified part.