We finally installed a go-wing, that Aaron got for Christmas, onto his Dart Sport. Someone asked me to post pics of the underside of the deck lid to show how the brackets mount. To make the install look a little neater, Aaron taped off the holes in the deck and sprayed black up inside as best he could.
I got the go-wing from Dante's Mopar Parts online. To ease locating the sheet metal cut-outs, they also offer a molded plastic template. I didn't want to pay the extra $30 or so; therefore, it took us a little longer to figure out where to cut without making a mess of it. It turned out great and really improved the overall look of his car.
Don't be afraid, give it a try,
Jerry