Right, got some quick pics to try show how this looks
Here is the rear of the bumper with the jet cover in situ, sitting on the bumper
See where the two legs of the washer cap protrude thru the bumper, they would then attach onto the washer jet which is attached to the bumper bar, so nothing happens with the bumper, apart from the hole thats needed and the washer cap rests on top of the bumper when not in use!
Top of bumper, no recess just rounded off square hole
Hope that explains more for you mate.
Project RS28 build
German cowboy walks into a car showroom and says "Audi".......
im stripping down a p reg avant starting monday and it as the washers fitted (but im keeping them lol), and im taking pics of how they are mounted etc as im refitting them to my facelift, and its the same colour so no need to repaint the covers.
i could post more pics if you need them and how they mount etc.