The thirty-three Km100-a3a 1978 Usa Canada / Mph Kph Air Cleaner/muffler (km100-a1-a4 component parts are all listed in this schematic.
Parts such as the Air Cleaner/muffler (km100-a1-a4: Cap,air Filter, Baffle Tube, Clamp, Washer-spring,5mm are included in the Km100-a3a 1978 Usa Canada / Mph Kph Air Cleaner/muffler (km100-a1-a4 parts fiche.
In this schematic the "Screw-pan Head,5x6" is used most often.