There are 2 different headlights. Most A6 C5's have single halogen or single xenon 2,5 inch lens projectors. This projector can be replaced with special projectors and brackets:
Pre facelift halogen:
Audi A6C5 - pré facelift (halogen headlights)
Pre facelift single xenon:
Audi A6C5 - pré facelift (single xenon headlights)
The facelift model also has a Bi-xenon headlight with a larger 3 inch projector lens. The facelift model uses Hella E55 projectors that can be replaced with this kit:
Audi A6C5 - facelift (xenon headlights)

Source: mithrilG60 on Hid Planet
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