This is in response to the setup
@pyrorobert has.
So I took a closer look at the cooler and gap above the bumper today where you have mounted the LED light bar.
I can easily feel the bolts on the side that you used to mount the LED light bar.
However, best I can tell, that cooler is a transmission cooler, probably needed when hauling a heavy load or climbing hills. Looking at the complete OEM set up, the only passage I can find for air to reach that cooler is thru that small open gap that you have put the LED light bar in. There is a plate at the bottom of the gap so no air would get to the cooler from the winch opening. Also there is the grill covering that blocks any air going thru the grill to go down and thru the cooler. With the LED light bar in that gap, it seems to be blocking the majority of the air flow thru there.
That is my biggest concern of filling that gap, that it will block air flow to that cooler and render it useless.
It will be interesting to see what the temps do as you haul a heavy load or climb a big hill with the LED bar in that spot.
I'm not criticizing the mount at all. That is about the only place to do a clean mount at a reasonable cost. Just concerned about towing or heavy loads and the cooler not getting enough air flow across it.