Parts such as the Muffler: Nut, Lock Washer, Clamp, Pipe, Buffle are included in the Fr50 1981 (x) (e01 E02 E06 E13 E24) Muffler parts fiche.
This schematic depicts all components used in the Fr50 1981 (x) (e01 E02 E06 E13 E24) Muffler partslist.
With a quantity of two pieces, the Screw is the most used part in the MUFFLER diagram.