Powerflex Polyurethane Bush kit for Porsche 911 Classic (1977 - 1986) Rear Anti Roll Bar Bush 20mm - PFF57-209-20 - For the 911 Classic models from 1977 on, for models 1974 to 1977 use 4 x PFR57-412-*. * Please measure anti roll bar diameter before ordering. Bush Style:- D shaped. - Bush Size: 20mm - 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!