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i have one on my truck.. extremely simple install. center it on the back of the bed, screw it in, and i ran power to the running light wire on my 7 pin trailer connector! done!
I don't understand what you are looking for... you have a picture of where it mounts and how it mounts, and someone else just told you how to wire it up...
I don't get what else there is to know about it.
You can find those things everywhere on ebay, tractor supply, our walmart here even sells them. Just measure the space you have available and make sure it will fit, but the standard ones are the same width as a license plate so that they will fit trailers.
The X's don't have the lip to mount it on like the trucks do, I already have it and know how to wire it up I was just curious as to how someone with an excursion has mounted it. I know I've seen one out there I just don't remember where.