Diffusor A6 Avant 2006 non Sline mit AHK

Hello, sorry to speak English but I don't speak German.

I can't find the answer I'm looking for. And here It seams that I should find something...

I have fitted a Thule Towbar and I need now a spoiler or to cut my spoiler.

Which model can I buy for my 2006 Avant ?

I have standard rear bumper.

The one on the picture can be fitted?

Thanks for all.

Nicolas