The most reasonably priced component used on the Cr125r 2003 (3) European Direct Sales Expansion Chamber (ed,u) is the Bolt,recessed,5x1.
On this parts fiche the Bolt,recessed,5x1 is the most specified component.
Some items from this specific schematic: Washer,plain,6mm, Washer,spg.,5mm, Body Comp,silence, Brkt,fender Nut.