If I am not mistaken, the center panel has 2 holes on each side. One about midway back from the window and then one at the back. On my car, I put a small bolt and acorn nut to fill the first hole and only secure my panel using the back hole. The fact the screen is secured in the U channel in front and bolted in back makes it totally secure. There is no banging or movement. I did this because I couldn't see removing 4 bolts to get that panel out. Using wing nuts on the back two bolts make this a 2 second removal.
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