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From what I recall (don't have them on my own car-but when we did an install) you pretty much decide how far you want them to stick out.
So hold up the sideskirt/prop it up books/boards/wood etc with it on the car, and eyeball it until you like the distance that it sticks out.
Then, install it with self-tapping screws.
Not real precise, but thats how we did it last time. Also, make sure you measure the distance on one side first, and match that to the other of course-so one side doesn't stick out more than the other.
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