When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have them on my '92 F-150... ordered them as an option from the factory. The lights mount into holes in the roof, and are held on by two screws which also screw into the roof. The electrical wiring comes out of the light fixture, through the mounting hole, then under the headliner, down the windshield side plastic molding, then hooks to a lead from the wiring harness under the dash.
The lights look great, and they do actually add a safety advantage... other vehicles can see the truck earlier when it is coming over a rise.