Down the back of the wing, there are 2 or 3 bolts that are buried under thick underseal, If your replacing the wing, it might pay you to cut the back of the wing with a jigsaw, leaving a few inches of the original in place, this will allow you to easily locate, those hidden bolts, using a hot air gun can soften the underseal, just enough to get a socket on.. if your lucky!, otherwise, it will need scraping off.
Hope this helps
Tom