Decided to flick through the DBA brake catalogue and see if there were any larger diameter rotors to fit our trucks. Namely to eliminate brake pad overlap when using Montero twin pot calipers.

For reference (all measurements in mm)
1st gen
Diameter - 255
Height - 34
Thickness - 20
Min thickness - 18.4
Centre hole - 84
Stud - 6

2nd gen
Diameter - 258
Height - 33.5
Thickness - 22
Min thickness - 20.4
Centre hole - 84
Stud - 6

Montero
Diameter - 275
Thickness - 24
Stud - 6
(Minimum thickness was thicker than the nominal 2nd gen thickness and height was about 46...)


So I found 2 that are potentially winners
Great wall v200, v240, x200, x240
L2 series rwd/4wd
4 door wellside and 2 door cab body
06/09 on
Front disk DBA part 2290
Vented
Diameter - 270
Height - 36
Thickness - 26
Min thickness - 24
Centre hole - 88
Stud - 6

Holden Frontera 4x4
2.0L with/without and
Sport 4x4 Ute
S and se V6 and 4 cylinder
3/95 - 8/01
10/95 - 6/99
2/99 - 8/01
Front DBA part 840
Vented
Diameter - 280
Height - 36
Thickness - 26
Min thickness - 24.6
Centre hole - 87.5
Stud - 6

Potentially pretty close. All seem to be 6x139.7 pcd
Maybe they are a little thick, will have to measure up the calipers with some new pads.

A good starting point maybe