The Air Cleaner (rm50c) is made up of components including this Cleaner Assy,air which is the most expensive.
Parts such as the Air Cleaner (rm50c): Cleaner Assy,air, Clamp, Screw, Clamp are included in the Rm50 1980 (t) Air Cleaner (rm50c) parts fiche.
In this schematic the "Screw" is used most often.