Porsche 928 (1978-1995) Rear Upper Control Arm Bush - PFR57-718BLK PFR57-718 Upper Control Arm Bush is made in our Grey 95A material and supplied with special CNC-machined 303 grade stainless steel tapered sleeves. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!