I want to also add that I would go with a JHM axle before an Autozone unit. I just visited the webpage and am rather sad that they don't have rear axles for the Quattro. Only front axle units, but I would still trust JHM over Autozone. More expensive, but you get what you pay for.

http://www.jhmotorsports.com/shop/ca..._62_63_125_213