Despite everyone saying it's not possible I decided to see for myself so I bought a set of front and rear mud flaps from my dealer. Just fitted rears today and took a few hours, to be honest they almost fit anyway but half an hour with a dremel to reshape the contour made them follow the lower part of s-line bumper much better. Ignore fitting instructions in the box as they sit a bit lower than the instructions suggest and just drilled two new holes to the inside lip of the wheel arch liners, needed a couple of longer bolts too but otherwise straightforward. Will try to upload some photos in a bit. Next weekend will try fronts, a quick look suggests more modification of the flaps will be neded.