The component with the lowest price in the REAR SWING ARM/CHAIN CASE schematic is the Tapping,5x12.
On this parts fiche the Bush,rear Fork is the most specified component.
Parts such as the Rear Swing Arm/chain Case: Wash.,chain Slide, Slider,chain, Nut,hex.,8mm, Pin,cotter 2.0x15 are included in the Cb250 Nighthawk 1991 (m) Canada / Kph Rear Swing Arm/chain Case parts fiche.