Take everything off the truck, assemble the bumper to the brackets loosely first on the bench or floor. I predict you will be able to line up all 4 of the bolts, if it goes like it did for me. Then assemble the brackets(with the bumper) to the truck frame. You might need another pair of hands to keep things from scraping your fenders. As you tighten, the bracket will pull into the bumper narrowing that gap you are showing. Come back again later and retighten. That gap will still be there but much closer than it is now.
