If you ever get stuck the ballast from a MK1 Audi TT is the same as the C43 also its worth knowing ad they are far easier to come by and cheaper. I had to replace one on the mrs S202 and we used a TT one.
IIRC the ballast assembly was in the region of £500 from MB. The 202 ballast "assembly" is handed but the ballast itself is the same, both sides.
What makes the assembly handed is just the mounting bracket. As you can see in the pic below,
Drivers side on the left of the pic, passenger side on the right.
New genuine Bosch ones can be bought from e-bay, AL BOSCH D2S D2R Xenon Headlight Ballast MERCEDES SL / S CLASS AUDI TT BMW E46 | eBay
getting a new ballast from Audi for less money is great.
are you saying that I could swap the wireloom from a broken ballast and fit onto the new one?
is it just taking the plug and press it on onto the new ballast if there is a plug or is cutting off the loom from old ballast and reattaching it onto the new ballast that needs to be done?