No holes anywhere, bolts,lights or bumpers. BUT the indents for cutting out are there so you know where to put them.
Basically you need to fit them and drill. I believe the best idea is to tape the spot to be drilled so you don't fracture the fiberglass ( Matt would be the one to ask ). Then prior to cutting bumper/light mounts I would measure and make sure everything is even. I would also make a very thin piece of tin/plastic insert for where the rocks would get kicked up on the underside to protect them - they are very lightweight, I think Geoff said 2 pounds, can't remember.
They are the same fenders as Geoff runs on the "PINK" car.