I got the bushwacker OE spec ones on my truck. The front went on with no problems. But with having the stepside bed, the fender flares pushed out on top of the fender. I drilled two holes on the top (through flare and fiberglass) and installed a small push pin to retain them and make sure the don't push back out. But with a regular bed, they should bolt up just fine with predrilled fender holes. Well my truck had predrilled ones, not sure if yours does. Here is some pictures.
-2011 F-150 Lariat: 5.0 "Coyote" V8, 6-spd Auto (6R80E), 3.73 ELocker. White Platinum Metallic Tri-coat.
-1992 Ford Ranger: 4.0L OHV, 5spd (M5OD-R1), 3.27 Open.