The Washer,plain, 8mm is the lowest priced item on this Exhaust Muffler schematic.
Parts such as the Exhaust Muffler: Gasket,ex.pipe (nas), Bolt,flange,dr,8x, Collar,muff.mout., Nut,flange,7mm are included in the Cbr900rr Fireblade 1997 (v) Germany Exhaust Muffler parts fiche.
Check out any of the eleven Exhaust Muffler components enlisted.