The Cushion,seat(40x20x15) is the most widely applied product in the GSF600S BANDIT 2001 (K1) USA (E03) SEAT ( four times ).
Some items from this specific schematic: Screw(6x14), Lock Set,seat & Helmet, Bracket,seat Support,right, Lock Set,seat & Helmet.
The component with the lowest price in the SEAT schematic is the Screw.