You have two locker options that I know of for the rear - ARB air locker or a Lock-Rite auto locker. Both applications need to be for the older Isuzu Trooper 12 bolt rear - i.e. the "smaller" ring gear. I had the clutch packs on my rear LS disintegrate and was told by several Isuzu sources that there are none available in the US and they don't know when or if they would make more. Went with an ARB and love it.