All aero's have the issue of the nearside wheelarch as there is no air filter tube that side to protect it.
My matt black aero suffered from that exact type of ding which was an expensive fix due to paint costs. I glued a rubber liner to the underside to prevent further issues.
I have the "wheel arch ding" problem on the o/s., just in front of where where the inner bulkhead between the wheel arch and the air-filter housing joins the wing.
There is a single pimple on the wing, about 1mm in diameter and VERY obvious when the light catches it.
So some sort of impact adsorbing liner is clearly needed.
I'm thinking of using the "hairy plastic matting" intended to cut wheel spray.
