Just had my rear springs done on my Quattro. You can now get these from GSF etc as they are now listed on their parts(They weren't last year-recent development). Anyway mate of mine in the trade got them from TMS and fitted them. They were longer than my old ones and made the car sit a little higher at the back. I find at speed in a straight line the back end feels wondering. Could he have been supplied the wrong springs. He states they will change them for the "heavy duty" ones. I think he has been sold the wrong ones. The reason for changing was my rear tyres (months old) have been worn right done to the wire on the inside edge on each side. I knew I had a broken spring on drivers side right at the top. Then when replacing the other side anyway it turned out it was broken right at the bottom. I take it this would be the reason for scrubbing the tyres as there would have been a camber change? John.