In this schematic the "Bolt (2h7)" is used most often.
The lowest price component in this Exhaust parts-list fiche is the Washer(526).
Parts such as the Exhaust: Pipe, Exhaust 3, Muffler 1, Bolt (661), Bolt, Hexagon Socket Head are included in the Xz550r Vision 1982 (c) Usa Exhaust parts fiche.