Been looking a lot for one for the Colorado, and being pretty much the same shape, I'm liking the TJM and Ironman bars.
The ARB from the photos I can see, seems to sit a fair way out from the grill.
Maybe it doesn't, but it looks that way.
There was some discussion on one of the Dmax forums a long time ago and if I remember correctly, after much argy bargy, members actually measured the distance of several bars from the bonnet. All were within a few mm of each other including the ARB.
KB