Parts such as the 032 - Fuel Tank: Quick Fastening, Rubber Pad, Clamp, Damper, Sound Arrester are included in the Ss 2017 (supersport) D250-00017 032 - Fuel Tank parts fiche.
The component with the lowest price in the 032 - FUEL TANK schematic is the Screw Tcei M5x14.
Of all the components used in this assembly the Tank Red is the most expensive.