I had one of those "stam-bar" rear adjustables many years ago. Look at the stambar on Mustangs Plus and the pic is the same as the swaybar.com parts. The end links (mounted on the leaf spring) at bump would hit the rear calipers so I took it off. Turns out I wasn't the only one with the problem and I have seen a few vendors state that you can't use it with a rear disc conversion.