This REAR CUSHION assembly utilises four Bush,rubber(s) - the highest specified component.
Some items from this specific schematic: Cushion Assy,l Re, Washer,8.5x26, Bush,rubber, Collar Rr Cush.
The most reasonably priced component used on the Gl1500ct Valkyrie 2000 (y) Canada / Rbm Win Rear Cushion is the Bolt,hex,8x12.