The most reasonably priced component used on the Gs500f 2004 (k4) Usa (e03) Cowling Body (gs500fk5) is the Screw(5x18).
On this parts fiche the Screw(5x18) is the most specified component.
Some items from this specific schematic: Panel, Front, Cowlingbody Bl, Screw(5x18), Tape Set, Side For Bp9.