Some items from this specific schematic: Clamp,35mm,f.black, Clamp,42mm,black, Holder-exhaust Pipe,f, Muffler,rh.
The seventeen Zx550a6 Gpz550 1989 Fg Muffler(s) component parts are all listed in this schematic.
On this parts fiche the Nut,cap,6mm is the most specified component.