Of all the components used in this assembly the Box Assy,seat Tail(red) is the most expensive.
Some items from this specific schematic: Box Assy,seat Tail(red), Tape Set,box Seat Tail(black), Box Assy,seat Tail(black), Cushion.
The component with the lowest price in the SEAT TAIL BOX (MODEL K2) schematic is the Cushion.