On this parts fiche the Bearing-roller,h1-cap is the most specified component.
The most reasonably priced component used on the Kx65aff 2015 Europe Frame is the Bolt,socket,8x20.
Some items from this specific schematic: Nut,steering Stem,25m, Bearing-roller,h1-cap, Bolt,socket,8x20, Frame-comp,sub,f.s.bl.