Parts such as the Headlight (1): Screw,tapping 4x8, Cover Rubber, Headlight Assy.(1, Socket Assy.,posi are included in the Xl600v Transalp 1992 (n) Germany / 27p Headlight (1) parts fiche.
In this schematic the "Screw,tapping 4x8" is used most often.
The lowest price component in this Headlight (1) parts-list fiche is the Nut Nylon Cap.
