http://www.danielsternlighting.com/tech/bulbs/Hid/conversions/conversions.html is the link I have.
But honestly, I see so many clear-light illegal conversions (front and rear), blue lights, smoked lenses, lense covers et al that never get the attention or a ticket around here that I doubt you'll get noticed in most smaller cities. It does give them a reason to pull you over if they want, then suspicion can get them further, middle of the night and a nervous officer is not what I like.
Buy some good Euro lights (also illegal in the US BTW) and you'll get much better light output, better pattern, better in rain/fog/snow due to the sharp cutoff, and you'll be happy. HID conversions are almost always messy and I wish I had a pellet gun for every one I see coming the other way.