I need to get some information about changing out an exsiting HID headlight assembly with a Halogen setup. It will be going in to a 2000 TT Roadster, the reason is the vehicle was in an accident a while ago and the HID on the other side was replaced with Halogen and now I want to make them both to match.

I need advice on.....

Any wiring harness or patch cable that will be needed.
Good vendors online to provide the part.
and any information that anyone could offer, as to the best approach for doing something like this.
The actual name of the part