I think if you get ahold of suvlights.com you can order their 9004 to 9004/9007 conversion harness that'll be what you need. I'm sure someone else offers the harness or you could make it yourself for much cheaper, but if you're interested in purchasing instead they make a pretty nice harness. I bought two of them, one for each side. It comes with relays and takes power off the batteries to power the lights instead of putting the load on the factory switch. All you have to do is mount the relays and plug your factory harness into the new one, which has two plugs for the dual lamp sportlights. By the way, where's a good place to buy the sportlight housings? I'm planning on doing a conversion on my other pickup and was wondering on where to get some. Anyway, hope this info helps a little.
Shawn Huizenga