Better make sure you find something that meets Mitsu's OE spec. Mitsu auto gearboxes use Diamond ATF SP-III, which is similar but not identical to DEXRON III. Many owners that have used DIII in their Mitsu gearboxes have suffered tranny problems and premature failures.
Dunno about the CVT, but be safe about it and find the right oil; if in doubt, just use OE oil. CVTs are prone to leaks and failures.