On this parts fiche the Bush,rear Fork is the most specified component.
Parts such as the Rear Fork - Chain Case: Washer Rr Fork, Case,drive Chain, Bush,rear Fork, Washer,6x9 are included in the Cb250rs 1980 (a) Germany / Type2 12.5kw Rear Fork - Chain Case parts fiche.
Of all the components used in this assembly the Fork,rr.*nh-1* is the most expensive.