The Screw is the cheapest item from this partsfiche.
The Air Cleaner is made up of components including this Cleaner Assy,air which is the most expensive.
Parts such as the Air Cleaner: Screw, Clamp, Filter, Clamp,air Cleaner Side are included in the Gn250 1999 (x) (e02 E04 E22 E24 E25 E34 E39 E71) / P37 Air Cleaner parts fiche.