They are designed to fit with side skirts arent they?

The problem i have is that when the rear arches were done for the previous owner, they replaced them with metal but fabricated the sections themselves. This meant when i tried to fit side skirts before, they did not fit where the spats are. The shape is not correct. This is part of what i want fixed when i have the car restored.

I have new wings for the front even though the ones on are great. So i am not too worried about drilling holes.

The matching to a side skirt may be the issue for me unfortunately.