Check out any of the eighteen Kupplung components enlisted.
Parts such as the Kupplung: Circlip(13t), Clutch Carrier Assy, Key, Straight (3l5), Circlip(13t) are included in the Pw50 2003 5pg6 Austria 1b5pg-332g1 Kupplung parts fiche.
The lowest price component in this Kupplung parts-list fiche is the Key, Straight (3l5).