i picked up the brake ducts yesterday. i have to get a new 3 inch hole saw ,i want a nice clean cut hole. i thought i had a set of side scoops but i cant find them so i will have to order a new set. the flat bottom duct goes in the quarter scoop and just pop rivets in place ,on the inside of course. the curved pair go on the inner wheal tub from the inside and just pop rivet as well. i will seal them with black 3M putty strips. these ducts will not work on a coupe because of the window regulator assembly and slide track.