Hi, did you buy your car brand new?
Also, your top picture, that is the rear of the rear wheel arch?
That thing that I am calling a stone deflector, it is angled/tapered at the bottom, but your front one should be angled at the top.
The reason why I am asking these questions is, to me it looks like some one has just fitted probably, a set of front wheel arch rear mounted stone deflectors onto the rear of your rear wheel arch - which is okay, but I would have expected them to be fitted the other way round, ie the angled/tapered end at the uppermost end and the squared off end, if the other end is squared off, to be at the lowermost end so that when/if rear mud flaps are fitted, the top of them would contact that point so that the mud flap and that stone deflector work seamlessly together and protect the rear of the car's body from stones and any other material being thrown up - unless Audi has some other new idea on how/where to fit these items.