The part number I have for the clutch master cylinder is 1J2721388A. I ordered the master cylinder last week by giving my chassis number and I picked it up from Audi this morning. However I just noticed the part number of the one they gave me is 6Q0721388D. I did a search on http://www.vagcat.com for 6Q0721388D and it doesn't even show up. I rang another Audi garage and asked was 1J2721388A superseded and they said no. Doing a google for 6Q0721388D shows up references Skoda and Seat? I'd like to figure out what the story is with this before I ring back the Audi garage I got the part from. Any ideas anyone?