On this parts fiche the Bush,fork Pivot is the most specified component.
Parts such as the Rear Fork - Drive Chain: Washer,plain,8mm, Chain,drive, Joint,drive Chain, Rubber,dust Seal are included in the Cb350k4 Germany Rear Fork - Drive Chain parts fiche.
The most reasonably priced component used on the Cb350k4 Germany Rear Fork - Drive Chain is the Washer,plain, 6mm.