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Reply to John
I used #6 stainless steel counter sunk philips head screws. I always "treat" any hole drilled in the body with rust proof paint on a small artist brush and also put silicone chalk on the screw.
It may not look like it, but the radii is tight to the rear of the wheel well, It only needs to draw the engine compartment hot air at the right of the radii out and into the air stream along side the car. I hope I understood your question.
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