WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying 5Th-Gear Gear Wheel
Courtesy of AUDI OF AMERICA, LLC
A - Separating device 22 to 115 mm, for example Kukko 17/2