Parts such as the Headlamp (not For U.s. Market): Nut, Cap,screw, H/lamp Lens Unit Fiting Scre, Lamp Unit are included in the Gs500f 2004 (k4) Usa (e03) Headlamp (not For U.s. Market) parts fiche.
fourteen components are shown in this Gs500f 2004 (k4) Usa (e03) Headlamp (not For U.s. Market) exploded diagram.
On this parts fiche the H/lamp Lens Unit Fiting Scre is the most specified component.