Not to jack the thread, but I also made my own perminate ones. A cheaper but effective solution if you have the welding machine. I just used the Happi Jacks extra bolt hole and with some figuring the angles came up with this:
I'm happy with the outcome and it works! The jacks are so much more stable...I think it should be a standard install, what ever the system used, especially on the swing out brackets. These clear the flares with plenty of room to spare.