Folks: What's the difference between the 016 300 052R (J..., AUL, AUM, APZ),\and the 016 300 052M (ADZ, ADY)? Both are 5 speed, torsen equiped and for the quattro. Transmission is for a 1991 200 20v Avant , US version, rear diff code AAT, trans ADZ. Thanks! -Peter Schulz 1991 TQW 1990 CQ Chelmsford, MA USA schulz@res.ray.com (work) peter-s@ma.ultranet.com (home)