Of all the components that make up this Headlight (kz1100-b2) the Nut,8mm has the lowest price.
In this schematic the "Screw-pan Head,5x12" is used most often.
Some items from this specific schematic: Washer-spring,5mm, Collar,head Lamp Fitt, Bulb,12v-60155w, Nut,4mm,focus Adjust.