I ordered the comfort indicator kit from VW for a Passat, went straight in as per the Passat destructions. Can't see why the A6 should be much, if any, different. Think it was £35, cheaper than buying from E-Bay.
Wierd thing really as my mrs had it on her Peugeot 207 and it drove me mad. Went from wanting to over ride it on hers to quite liking it and buying the kit for mine lol