2006 Audi A4 Avant wagon has 2 Thule roof rack options?

[krisraines]

My 2006 Audi A4 Avant wagon has the side rails installed on the roof, the bars that run parallel to each other from the front to back of the roof on both sides. I like Thule Racks systems but am confused by what a dealer said, which was that there are 2 Thule roof rack model options available for mounting to the 2006 Audi A4 Avant roof rack side rails. How do I know which one I should choose?

[RACKSTAR]

Yep it's true that Thule Racks now has two car rack options for your 2006 Audi a4 avant roof rack side rails. They perform and function the same way however. The difference is mostly a matter of aesthetics...

The Thule 450 Crossroad complete base rack system attaches directly to Audi a4 avant factory rack side rails, converting your factory rack side rails into a sturdy base rack system capable of safely transporting all your gear. Includes a set of four Thule 450 Crossroad Feet and a pair of load bars. The 50 inch square load bars are the recommended length for your Audi a4 Avant. You can then attach the various Thule roof mount gear carriers to the load bars.

The Thule 450R Rapid CrossRoad complete base rack system works exactly the same way as the regular Thule 450 Crossroad system except that it uses the elliptical Thule Rapid Aero load bars (the RB47 Rapid Aero bars are the length necessary for your 2006 Audi Av Avant wagon roof top), which are very sleek and aerodynamic offering a more low-profile and modern appearance. All Thule roof mount gear carriers also connect to the Rapid Aero load bars, either directly or in combination with Thule Xadapt adapters.