[niterydr]

A must:
-Rod bearings
-Main bearings
-balance shaft bearings (either replace, plug, or what not)
-misc gaskets you'll need after tearing it apart
most likely:
-Oil pump assembly (not just the gears, probably need a front case, check spec)
-turbo
-crank will probably have to be machined
-rods possibly
-cams?
-hla's could just need a clean, oil squirters will need to be cleaned or replaced

Pretty much anything in the oiling system should be inspected for damage.
Mitsu parts we always use:
-Gaskets
-some bearings (if its a performance motor, it'll get kings or acl's)
-oil pump's
-sometimes water pumps
-misc other parts.
Mitsubishi has a very good quality control compared to most "aftermarket" parts companies, and it shows with the consistancy of the parts.