Parts such as the Air Cleaner: Screw,pan,4x19, Element,air/c, Tube,breather Ret, Grommet Cleaner are included in the Vfr750r Rc30 1990 (l) Usa California Air Cleaner parts fiche.
The most expensive part in this assembly is the Housing, Air Cleaner.
Of all the components that make up this Air Cleaner the Screw,pan,4x8 has the lowest price.