Of all the components that make up this Rear Hub the W-plain-s,18mm has the lowest price.
The Rear Hub assembly is constructed from several parts from which the Wheel-assy,rr,c.gray is the most expensive.
Some items from this specific schematic: Circlip 62 M/m, Collar,20x40x16.5, Ring,snap,56.2m/m, Nut,18mm.