The Ybs66-6 Washer, Plain is the cheapest item from this partsfiche.
This schematic depicts all components used in the Xp500 2011 4b5t Europe Tmax 1k4b5-300e1 10 Exhaust partslist.
The 10 Exhaust assembly is constructed from several parts from which the Muffler 1 is the most expensive.