twenty-one components are shown in this Nh125 Aero 125 1984 (e) Usa Air Cleaner exploded diagram.
Parts such as the Air Cleaner: Bolt,flange,6x25, Seal,air/c Cvr, Bolt Flang 6x12, Case,air Cleaner are included in the Nh125 Aero 125 1984 (e) Usa Air Cleaner parts fiche.
In this schematic the "Screw-wash,5x20" is used most often.