Hi, Kenny. The aftermarket wiring harnesses are made (or sold) by an outfit called APC and are available from different sources. I don't have that info in front of me right now. It's unfortunate that the search is down, or the info would be easy to find. I believe that if you have 'ground-switched' headlights (at least back to '99), the harnesses may require adjustment to work properly.
BTW, they are 14AWG; much better than some of that 20AWG nonsense in the stock trucks. They cost about $50 each, and two harnesses are required, one for the 9007s and one for the 9004s for best results.
I'll dig through my hard copy when I get home from the flying club meeting tonight, if no one beats me to it.
Tom