The Australian Mopar kit (NOT THE ONE OFF EBAY) it three parts, Towbar, plate relocation and wiring loom.
The kit requires you to cut the underhang off the plastic bar and fit a piece of rolled channel rubber, still pretty rough.
The number plate relocation goes to the left of the bar on the stepped section and has spacers so it sits flat. This uses the factory lights and new wiring loom and has a blanking plate to cover the old light wiring section in the middle of the bar.
Now if you want the ARB bar, then the towbar you get off ebay will suffice since you dont need any of the number plate relocation and blanking stuff.
I had the relocation kit but have now installed the ARB bar and the number plate is in the spare wheel. You could get the ebay bar and the ARB plate holder even if you dont want the ARB rear bar.
Last option is it moount the plate on the LHS quarter guard as the yanks do but our plates are larger and its more fiddly. Quadratec have relacement plates for that position but require the mount to be bolted to the quarter guard.
Phew...hope that helps
Matt.