I had to drill holes threw the hatch,yea i know right ? ugg ,but i did it just like the expedition that it was on and i don't mind, it's held on by 3 "fine tread phillips screws" along the top part of hatch lip an 1 on each side on the lower part.so altogether 5 holes The spoiler has brass insert/nuts glued in it from factory that made it for the screws to thread into. The lower part of the spoiler just holds on by studs with a plastic insert that you insert in the hole i drilled and once you press down on the spoiler the studs sort of lock into the inserts,BEING the way the hatch is made you can't screw or anything. i used a paint marker to paint all the holes i drilled and use plenty of silicone rtv. i think for 10.00 bucks was a good deal it's not cheap made either or aftermarket fits the roof curve nicely has the "ford" blue oval stamped into underneath it and says expedition air deflector, i googled part number but came up nothing says made in Canada too.and was already painted so i'll just keep it like that although there are scuffs and scratches oh well not and F giving
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