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On my old Mirrage I made an air dam by cutting the top half curved part off of a nissan sentra bumper that I had in the garage. It was to wide so I cut the center section out to narrow it and filled the center gap with a piece of plastic roll up sled so I would have something soft to let take the impact from unexpected road debris. I flipped it over so the part that curved towards the headlights and grill when on the sentra was now curved under the car.
I mounted it using doubled up strips of plumbing strap. This made it very ridgid but it could also shift back with out breaking it if I did hit something.
This gave my car about 2 inches of clearance in the front and gave me a very solid air dam.
another OEM bumper cut up to add to the bottom may give you the rigidity you need.
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