The sub assemblies and components that make up this Upper Casing include this Casing, Upper, the most expensive part.
The thirteen 6/8mhs 1994 Upper Casing component parts are all listed in this schematic.
Some items from this specific schematic: Screw Pan Head, Bolt, With Washer(61a), Gasket, Exhaust Manifold 1 (nas), Casing, Upper.