Some items from this specific schematic: Protector A,ex.pi, Gasket,ex.pipe (nas), Packing,protector (nas), Bolt,flange,8x40.
The lowest price component in this Exhaust Muffler parts-list fiche is the Bolt,flange,sh 6x10.
In this schematic the "Packing,protector (nas)" is used most often.