what about one from Auto-Zone / Wal*Mart etc... . that sticks to your window and do what I did with the empty space. It would work good for your lightbar, wig-wags, strobes, backup lights, air-horns or anything else.
I was told by my dealership that the small plug-in at the center of your truck (below the radiator) is for the temp sensor. I asked this when I was hooking up my sport bumper (I didnt have fog-lights) and saw the little plug in zip tied back. Im guessing DC has a harness that would replace yours somehow but I think that it would be costly and a PIA. Im not 100% on that though
(If you are looking for fog lights they are 117 @ the dealer and it comes COMPLETE down to the switch!!!)
Just a idea
Ian