Should be able to. Its part number should be RD261 in the rear and RD203 in the front. You might be able to find a chinese copy on aliexpress but no more info.
Sanding your knuckles before starting work can help. That way you cant skin them
I just fitted a RD203 to the front diff, and the back is the older RD44 which as Geeves says may have been superceeded by the RD261. The rear locker makes an enormous difference to the Mu, so much better than the limited slip. Its a must do. I only use the front locker as a get out of jail card. Both are Chinese imports which come with the compressor, wiring loom, switches, relays, hosing etc. www.china4x4extreme.com If you are usings anti sway bars, then you will love the air lockers.
Vehicle: 1992 Isuzu Mu 2.8l UCS55 Auto Trans, Inter-cooled, 2" Raised, Standard dump pipe with 2.5" exhaust, K&N filter, Snorkel, Raised Trans and Transfer Box with modified cross brace, Not lifted, 32 muds, Runva 9500 winch, disconnected sway bar, double air lockers