Either a new (to you) bumper that has them already installed, or be able to fabricate your own mounts as the OEM mounts are built into the bumpers. A relay, switch, and some wiring to hook up everything up and locate them where you want them. What's your skill level with wiring and electrical components?
Since your truck didn't come with them, your BCM isn't programmed to control them, and the necessary wiring, push button in the headlight control box, fuses and such aren't there. So the DIY version is pretty much your only shot.