Got mine through hotpart.com. J&M products Power coated red. No reaming needed bolted right up and are totally sealed up. https://hotpart.com/product/2015-2018-mustang-convertible-full-length-red-ultra-low-profile-jacking-rails-2/
1-hr install. Very easy to rid the resonator. Also hooked up to NXT step performance axle back. Sounds better now. Definitely worth while and from a local business in FLORIDA. Don’t let the cheaper cost make you think this is junk. IT IS NOT, some of the nicest welds. Too bad it’s under the car...
Well just got one thru eBay for under $200 delivered. Price way better then everything else I have seen. Will play with it and figure out the mountings and will post pictures if I come up with alternative ideas from what has been posted