This schematic depicts all components used in the Xl600v Transalp 1993 (p) Germany / 27p Meter (xl600vk/vl/vm/vn/vp/vr) partslist.
The Screw,tapping,4x12 is the cheapest item from this partsfiche.
In this schematic the "Bulb,wedge Base" is used most often.