Powerflex Polyurethane Bush kit for BMW E83 X3 (2003-2010) Front Anti Roll Bar Mounting Bush 23.5mm - PFF5-1503-23.5 - This part replaces OE number: 31303413134. Please check anti roll bar diameter before ordering. - Bush Size: 23.5mm - PRICE IS PER CAR KIT, NOT per bush. Powerflex usually price their bushes singly, but we have combined the QTY and price to keep it simple for you!