Searching for:
+front +locker = lots of hits
+front +lsd = lots of hits again

Locker is ARB, not sure if there is one for the 4-cyl, I think just the V6.

LSD options are based on StarQuest rear diffs and varies between years on what to mix-and-match.

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com