The component with the lowest price in the AIR CLEANER schematic is the Screw,pan,4x25.
The sub assemblies and components that make up this Air Cleaner include this Cover Comp,air/c, the most expensive part.
Parts such as the Air Cleaner: Case Comp.air/c, Tube,air/c.conn., Seal,air/c Case, Collar,t.mounting are included in the Cbr900rr Fireblade 1997 (v) Northern Europe Air Cleaner parts fiche.