The component with the lowest price in the SIDE COVERS/CHAIN COVER schematic is the Grommet.
The sub assemblies and components that make up this Side Covers/chain Cover include this Cover-side,rh,l.green, the most expensive part.
Some items from this specific schematic: Grommet,side Cover, Case-chain,black, Cover-side,rh,l.green, Grommet.