Porsche 911 Classic (1977 - 1986) Rear Anti Roll Bar Bush 20mm 20mm - PFF57-209-20 D-shaped bush for classic 911 from 1977 on. For 1974 to 1977, use 4 x PFR57-412-*. Check diameter before ordering. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!