Hello, I want to convert my headlamps to Xenon lamps with the integrated round DRL lamps (as per the RS4). I am aware that factory models also head a headlamp was system, but at this point I was wondering if anyone could help me with the necessary part numbers and a list of items required. Headlamps Ballasts - Different wiring loom? Any other physical parts required before making the changes on VAG COM? Many thanks!