What I did with my 01 was to use the switch for my fog lights to trip a relay that was under the hood that would send power to the new lights on the bumper. Tap into the feed under the hood near the existing location for the lights. Use that to trip the relay.

I also made it so those lights would be able to turn on without the main headlights turned on. To do that, it involved removing the steering column plastic cover and tapping into the wires and reworking them so that they didn't rely on one switch on to let the other switch work.

Poke around, someone has explained the process.