This is an insert to fit into the original bushing to minimize the movement of the diff under acceleration.

Diagram Reference #41

This part fits the following models:
Audi
A4
A4 B8 2WD & Quattro MLB (2008-2015)
S4
S4 B8 (2009-2016)
RS4
RS4 B8 (2012-2016)
A5
A5 B8 2WD and Quattro
S5
S5 B8 (2007-2017)
RS5
RS5 B8 (2010-2017)
A6
A6 C7 incl. Quattro (2011-2018)
S6
S6 C7 (2012-2018)
RS6
RS6 C7 (2012-2018)
A7
A7 incl. Quattro C7/Type 4G8 (2010-2017)
S7
S7 C7/Type 4G8 (2012-2017)
RS7
RS7 (2013-2017)
A8
A8 incl. Quattro D4 (2010-2017)
S8
S8 Quattro (2010-2017)
Q5
Q5 Quattro (2008-2017)
SQ5
SQ5 (2013-2017)