WARNING: This page is about a different car, the 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Driving In Ball Sleeve
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Install ball sleeve with the inscribed side (thicker metal) facing the drift.