I have a 2000 S4 and have been looking around to replace my stock headlights, more particularly on ebay. Majority of the sellers warned me that the headlights they're selling will not fit on the factory h.i.d. system. Are there any other places where I can find clear or smoked headlights that will fit on the factory h.i.d.? Or any ideas of how to modify it?

 

DIY clears

ecodes

Try these out -
there are lots of threads on this stuff though - try searching the archives, you should find some good stuff...