Well, I cut out light mounts, drilled holes for turn signals. I screwed up and cut the wrong size hole for lights, could have sworn they were 4.5", gotta figure something out now, I think that door seal trim will do the best, it will be flexible, good seal, and still give me room for fudge factor such as aiming and whatnot. I am in the process of putting the bedliner on, it actually goes on pretty good. At 30 bucks a quart, it better be nice.