On this parts fiche the Washer, Protecter is the most specified component.
This Exhaust diagram displays the required parts for the Xt350'88 1988 55v0 Europe 1855v-300e1 Exhaust.
Some items from this specific schematic: Bolt, Flange(1et), Pipe, Exhaust 1, Gasket, Muffler (nas), Protecter, Muffler 2.
