WARNING: This page is about a different car, the 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Installing Spacer Ring
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Drive new spacer ring in onto stop; do not cant ring when doing this.