Of all the components that make up this Rear Cushion Lever (model W) the Seal,oil(20x26x4.5) has the lowest price.
On this parts fiche the Bearing(22x28x16) is the most specified component.
Some items from this specific schematic: Bolt,rear Cushion Lever, Bolt,rear Cushion, Nut 12mm, Lever Set,rr Cushion.