Alfa Romeo Spider 939 (2005-2010) Rear Trailing Arm Front Outer Bush - PFR1-510BLK These bushes incorporate steel support washers that are designed to spread load across the arm and protect the bushes from sharp edges found on pressed steel arms. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!