This EXHAUST assembly utilises four Washer, Protecter(s) - the highest specified component.
The most reasonably priced component used on the Xt350 1986 55v Europe 2655v-300e1 Exhaust is the Screw, Tapping (30x).
Some items from this specific schematic: Bolt, Flange 8x20, Washer, Plate (36a), Band, Muffler, Protecter, Muffler 2.