The most reasonably priced component used on the Mbx80fwd 1983 (d) E-6 Left Crankcase Cover is the Nut Hex 12mm.
With four applications this Bolt,flange,6x35 is the most specified part.
The ten Mbx80fwd 1983 (d) E-6 Left Crankcase Cover component parts are all listed in this schematic.