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Not sure what you’re doing but…. If installing lights on truck that didn’t come with them , I would look into the Recon kit. Smaller hole with better mounting and sealing.
You should either remove the "techrep" name or refrain from smart aleck answers. Neither are helpful to the community.
There was a company/product highlighted in another post - it may have been Recon as noted above. I'll see if I can find it. It was for cab lights that mounted to the roof without any drilling, screws, or holes in the roof. They were pricy but definitely the way to go if you want to avoid wiring and possible water intrusion.
The company was Spirit Fire - maybe check them out.