The component with the lowest price in the SEAT schematic is the Cushion(11.5x22x20).
With all the components that make up the TL1000R 2003 (K3) USA (E03) SEAT assembly. The Cushion,seat(40x20x15) is the most frequently specified with two applications.
The Seat assembly is constructed from several parts from which the Seat Assy is the most expensive.