On the old F-150 the box was a complete piece of crap, piled bundles of shingles on top of it too many times. lolDeeZee low profile, perfect fit, getting beat up, used daily...old picture...
Mounted using the existing mounting holes for the bed. I forget the thread pattern but, all you need to do is find longer bolts and some washers, drill the holes in the box and you are good to go.how does that puppy mount?, are you happy with it? do you recall a part # and cost?