For what it's worth... we installed a Smittybilt Jeep Wrangler bumper on our G2.5 [$100 CL find].
Actually, we used the center-section, then removed the "ears", and constructed new "ears" [exterior portions].
The center-section fit like a glove - on a rig that has a 2" Body Lift... we were able to use the oem factory bumper mounts [that bolt to the frame horns] - welded to the Smittybilt bumper.
it will NOT fit a G2.5 if it has NOT had a body lift performed.
That is, it will not fit the front body panels/ contours - unless the bumper is pulled away from the body, by several inches...
Even then, the raised area on the "ears" will likely interfere with the headlights [ability to shine unimpeded light].
"Ears' were made of 3/16" plate steel... 1-piece sides [w/ appropriate bends] & 1-piece top plate, along w/ plenty of backside bracing.
Far cheaper than an ARB... definitely able to dance with wandering cows [yes, that is a problem for us].
Most any Jeep [Wrangler/ CJ / etc] bumper [that I am aware of] is not going to have the dimensions required for our Monteros.
But, it doesn't hurt to think outside the box...
See page 6 of the following thread, for a large picture of the rig;
SoCal Montero Meet-Up Saturday 3-25-17 @ 10:00-12:00
Good luck,
- Wm.