You have to drill a hole through the upper black plastic. Remove one of those "air vents" that allows access to the internal area. On the top left of this picture, you see what looks like an air vent. Remove the vent, hand bend a bracket to contour and work, drill the hole in the right place. etc...
2014 Mustang GT custom ordered to replace the GT500: Sterling Gray, NAV, Recaros, Brembos, Glass Roof, back up camera, 6 speed auto, loaded
2012 Focus Titanium - 18" wheels with handling package
2009 GT500 Shelby (700 rwhp) - sold