Parts such as the Rear Combination Lamp (e34): Bracket, Licence Plate, Bulb(12v21/5w), Cushion, Bracket, Washer(6,5x22x1.6) are included in the Gs1000g 1981 (x) General Export (e01) Rear Combination Lamp (e34) parts fiche.
The Bolt is the cheapest item from this partsfiche.
Of all the components used in this assembly the Lamp, Rear Combination is the most expensive.