On this parts fiche the Screw,tappin,5x40 is the most specified component.
A sample from the products for the Air Cleaner include: Seal,air/c Cover, Cover Air/c Case, Case,air/c, Washer,plain,6mm.
The nineteen Pk50 Wallaroo 1999 (x) Denmark / Mp Std Air Cleaner component parts are all listed in this schematic.