I am just wondering if you ever found this out? I had my VW MK6 GTD in for a service today and they have just rang me to say there is oil leaking from the rear shocks and they need replaced and are quoting me £550 to do the job!
Wouldn't mind finding out what the standard model is in them and pricing myself. Also - my car has Adaptive Chassis Control - not sure if there is a different shock again!