[color:"blue"] ARB Air Locker [/color] locking differentials:

2.6L I4 Montero (GenI):
Fr Locker = N/A
Rr Locker = P/N RD05

3.0L V6 Montero (GenI):
Fr Locker = P/N RD110
Rr Locker = P/N RD46

The following courtesy of LeeN:

3.0L V6 Montero (Gen II W/ 5 spd):
Fr Locker = P/N RD110
Rr Locker = P/N RD25

3.0L V6 Montero (Gen II w/Auto):
Fr Locker = N/A
Rr Locker = P/N RD25

3.5L V6 Montero (Gen II):
Fr Locker = P/N RD110
Rr Locker = N/A


Air Locker Accessories:
ARB 12V Air Compressor = P/N RDCKA
Pneumatic line repair kit = P/N ASK001
Tire inflation kit = P/N PUKT