Just installed PIAA 510's in the factory location with the provided harness. They work great and the included harness is nice. I was concerned about mounting into the plastic bumper at first, but it ended up working nicely. I removed the plastic inserts and set the stock PIAA bracket in the center between the two bulges I cut the hole with a 90* air powered angle grinder and burr bit. I tossed the factory mounting nut and placed two large fender washers underneath along with a flanged M10 nut to spread the clamping force over a larger area. They're very secure.
I mounted the relays for both lights into two unused M8 threaded holes on the driver's side inner fender. I used "mini" fuse holders since they are the same type fuse as used elsewhere on the truck.
I ditched the factory 16 ga wiring for the Hella fogs/rear backup lights and upgraded to 14 ga and ran it down the driver's side frame rail. They are grounded on a stud behind the driver's side taillight.
I used an amber switch for the front lights and a red switch for the rear lights both from Oznium. They energize the relays with power from the under dash fuse block which is only hot when the key is in the "on" position.
PIAA 510 Plasma Ion Fog Lamp
Hella Optilux 1200 Fog lights (used as backup lights)