I have an 05 DC and my overfender flares just screw on using the existing factory holes in the fender. There is nothing holding them on up top except the pressure from being pushed against the truck itself. They do have a rubber strip that goes around the edge so that they will not scratch the truck. There are also two different kinds of flares that are installed on the truck. Some of them are two pieces on the front flares and some are the one piece on the front flares.