IIRC people were getting similar quotes to retrofit an armrest in the mk5. Presumably the mk6 still has the air vents in the back of the armrest for the rear seats? This is what a lot of the cost is about - making these work. If you're not bothered its straightforward to fit. I'm sure there are some how to's for the mk5 if you google them. The fundamentals will be the same if not the details...