Parts such as the Crankcase: Nut, Bolt 10x20, Screw (6x45), Screw (6x35) are included in the Zr50slk 1981 (x) (e02 E21) Crankcase parts fiche.
The most reasonably priced component used on the Zr50slk 1981 (x) (e02 E21) Crankcase is the Pin.
thirteen components are listed in the schematic for this Zr50slk 1981 (x) (e02 E21) Crankcase .