The Nut M5 is the lowest priced item on this 021 Headlight & Instr. Panel schematic.
The fourteen Mts1000ds 2004 Usa (multistrada 1000 Ds) 9151-1882b 021 Headlight & Instr. Panel component parts are all listed in this schematic.
Some items from this specific schematic: Bracket, Movable Healdight Fairing, Nut M5, Screw Tceif M8x20, Headlight Holder.