Parts such as the Upper Casing: Bolt (695), Gasket, Exhaust Manifold 2 (nas), Washer, Plain (663), Screw Pan Head are included in the Cv25e(em)d 1990 Upper Casing parts fiche.
The component with the lowest price in the UPPER CASING schematic is the Washer, Plain (663).
On this parts fiche the Bolt (695) is the most specified component.