WARNING: This page is about a different car, the 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: Installing Spacer Ring
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Push spacer ring in as far as it will go, ensuring it is not crooked.