Parts such as the Rr,mudguard Extensio: Screw,special 5x9, Nut,flange,5mm, Rr.mudguard Extensio are included in the Gl1500c Valkyrie 1999 (x) England Rr,mudguard Extensio parts fiche.
Check out any of the three Rr,mudguard Extensio components enlisted.
On this parts fiche the Screw,special 5x9 is the most specified component.