WHICH STEERING CONTROL LEAD. CTSAD002 OR CTSAD003

[shady-ninja]

was contemplating on fitting my Kenwood DNX 7240bt to my 2009 A3.
it has a SYMPHONY 6 CD changer up front with an AUDI sub at the rear.
which of these conrols do i need??

 

[shady-ninja]

help