One of the things that disappointed me when I bought my Avant was that it was right on the model change so I never had LED lights. I know that there is Kufatec that sell them but it appears to be quite a bit of work.
I recently found out that finally Audi do a retrofit kit so I have just had it done. I'm very pleased with it and now the car feels to me like I always wanted it to. It is genuine Audi parts fitted by an Audi tech so warrented and all that jazz.