Parts such as the Taillight: Cussion Collar, Taillight Unit, Base,taillight, Bulb,taillight are included in the Cb250rs 1980 (a) Germany / Type 1 19kw Taillight parts fiche.
On this parts fiche the Cussion Collar is the most specified component.
thirteen components are listed in the schematic for this Cb250rs 1980 (a) Germany / Type 1 19kw Taillight .