This REAR ARM - REAR CUSHION - CHAIN CASE assembly utilises four Seat, Spring Upper (291-22213-70)(s) - the highest specified component.
The Rear Arm - Rear Cushion - Chain Case assembly is constructed from several parts from which the Rear Cushion Assy is the most expensive.
Check out any of the fourteen Rear Arm - Rear Cushion - Chain Case components enlisted.