A6 roof rack
 

Hi guys ... I'm looking for a roof rack base that will fit the 2008 A6 quattro. Its kinda hard to figure out if there is any cross over from other audi models. The base needs to be able to attach between the door and roof line --- there is no factory rail on the roof to attach to. Does any one have a model # or know if A4's similar year would work?
Appreciate the input.