I finally cut the wheel covers down to the rim diameter +15 mm (vs +28 mm).
I removed my 2 mirrors and put 2 white plastic panels, I will work on inside mirrors.
I finished the wheel skirts. Some tape before and after to make the airflow as smooth as possible.
I will have to bore a hole into the covers because now if I wanted to check air pressure I would have to remove the whole skirt and cover.