Energy sells a kit that has brackets that uses their bushing mounts. Basically remove the stock bushing and bracket and use their stuff. I have a set I tried to use with the Addco bar but it pushed it too far back. Id's sell it if your interested. Its new other than my mock up. I don't recall the bushing ID that came with my kit as they sell the same kit with larger bushings for a B-Body. I'd have to look and measure.
