http://www.dba.com.au/default.asp
For the MU 2.8-
DBA specs the front brakes are closest to the HOLDEN -> JACKAROO / TROOPER - ISUZU (GM) -> UBS 17 (1988 - 91)

MU 3.1-

Also hand brake cables for Mu and Rodeo. From old forum
Hand break cable right side holden number 97015299
Hand break cable left side holden number 9701300
These fit but 1 is longer than the original i carn't rember witch side

There are a few different brands for pad but most of us are using Bendix 4WD pads which have a pretty good reputation.

MU 2.8
Front (Bendix) DB11116
Rear (Bendix) DB11161

MU 3.1
Front (Bendix) DB 1270 front
Rear (Bendix) DB1280 rear


Trooper
Front Awaiting for a confirmed trooper owner to PM the correct Bendix part numbers
Rear

Additional info
88-92 jackaroo/trooper/bighorn has the same as 2.8 MU
I think you will find 92-96 jackaroo/trooper/bighorn on will have the same as the 3.1 MU