FrankenAudi roof rails

[JDD]

Hi, I hope someone can help me.

I am trying to get roof bars for my 2011 A6 Allroad. The rails appear to be 2012 as the 2011 that Audi told me are the ones (4f series ) don't fit at all. The rails match the 2012 photos (4g series) I can see on the web. The width between the rails is approx 104cm at the inner faces. The clamp/bracket pin holes are approx. 90mm apart. Can anyone tell me what the width is between the closest faces on the 4G9 071 151 L series bars is, and if the bracket/clamp width is adjustable at all?

 

Many thanks