Help with which Bilstein shocks

[johnnevett]

hi
I was looking at getting eibach sportlines to lower my audi b8 2.0tdi and matching them with bilstein shocks.
question is: which bilstein shocks do I need? B6, B8 or would the complete kit B12 be best?
I just don't know the difference between the B6 and B8 bilstein shocks
thanks