The Washer,plain,6mm is the lowest priced item on this Headlight schematic.
Parts such as the Headlight: Bolt,socket,6x25, Rubber,h/l Mt., Collar,rad Mt, Bulb,position (12 are included in the Cb600f Hornet 2010 (a) European Direct Sales Headlight parts fiche.
In this schematic the "Duct Comp" is used most often.