Which Sirius tuner do I need?
 

Hi there,
trying to find one on ebay, and there seems to be two models, the main difference seem to be: one vs two antennae ports at the back. Newer units for newer cars need only one, maybe?

my car is:
2008 A3 2.0T
Stereo head unit: Concert (the base, i believe)
Has lame OEM I-pod adapter installed


I guess another way of asking would be, anyone know the official audi part number for my year? thanks