The most reasonably priced component used on the Z50j Monkey 1979 (z) Australia Exhaust Muffler is the Screw,cross 5x6.
The Honda EXHAUST MUFFLER has nineteen products enlisted in the schematic.
Parts such as the Exhaust Muffler: Packing,protector (nas), Screw Cross 6x14, Washer,plain,5mm, Nut,hex 6mm are included in the Z50j Monkey 1979 (z) Australia Exhaust Muffler parts fiche.