Except the BSH was hollow so it flexed, and thus affected performance, the same as a smaller solid bar. All H&R bars are solid. Nothing comes close to the 28mm solid H&R bar. H&R products always fit perfect and the Teflon bushings are the best design available.Wasn't it only this one and the BSH that were 28mm? And, of course, the H&R bushings are what make them the best anti-roll / sway bar, period.