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The self tapping type worked well for me too. A couple of hints. Find a sheet metal screw with the same threads to start the threads into the fiberglass. Work the screw back and forth gently to cut the threads. This lessens the chance of snapping off one of your studs. Also install the studs with a thin nylon washer to minimize paint damage. This method worked for me. They have held up for 15 years now.
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