The lowest price component in this Air Cleaner / Fuel Tank parts-list fiche is the Bolt,hex., 6x16.
This schematic depicts all components used in the St90 Trailsport 1975 K2 Usa Air Cleaner / Fuel Tank partslist.
A sample from the products for the Air Cleaner / Fuel Tank include: Bolt,hex 6x12, Plate, Single Seat Assy., Band,tube,cleaner.