Hey guys - I recently got some new Cusco strut tower braces. The front went on beautifully. The rear is another matter. After pulling up the carpet and trim in back I found that there are no existing mounting points matching the rectangular patterns on the bar. Is this a custom install piece? It did include a small package of nuts and bolts. Just wanted to verify before I did something irrepairable. Also if they are the drill your own hole type, where exactly do the holes go?