SuperPro 2004 Subaru Impreza WRX STI Rear 18mm Sway Bar Mount Bushing KitSway Bar mount bushes are an important part of the whole sway bar system. Worn or rubber bushes in these locations lead to movement in the sway bar in unwanted directions that effect the effectiveness of the sway bar. An upgrade to SuperPro bushings can return lost sway bar performance and improve handling. This Part Fits: Year Make Model Submodel 2004 2007 Subaru Impreza WRX STI 2007 Subaru Impreza WRX STI Limited