With a quantity of five pieces, the Bolt-upset-wp is the most used part in the SIDE COVERS/CHAIN COVER diagram.
Some items from this specific schematic: Bolt-flanged, Bolt-upset-wp, Cover-side,lh,p.white, Cover-side,lh,s.red.
The sub assemblies and components that make up this Side Covers/chain Cover include this Cover-side,lh,p.white, the most expensive part.