On this parts fiche the Bolt 6x14 is the most specified component.
Some items from this specific schematic: Fender,rr Fr, Cover,rr Fender Upr, Fender,rr Fr, Clamp.
The Rear Fender (model K4/k5/k6/k7) is made up of components including this Fender,rr Fr which is the most expensive.