Some items from this specific schematic: Gasket, Cylinder, Nut, Flange (17l), Gasket, Cylinder Head 1 (nas), Bolt, Stud (5g6).
On this parts fiche the Bolt, Stud (5g6) is the most specified component.
This Cylindre - Culasse diagram displays the required parts for the Ch50 1989 3ec4 France 293ec-351fa Cylindre - Culasse.