r-r-r-retrofit!
-S2K projectors
-S2K ballasts/ignitors
-Phillips D2S bulbs
If you don't have the knowledge/ability to do it, there are shops that can do it. It's all about light output and cutoff. If you don't know of any, Custom Lightz in VA is awesome. I wouldn't trust my uber-expensive S2K parts to anyone else.
Or you could just buy a generic p-n-p kit..but the light cutoff would be ugly, and illegal.