Porsche 911 997 (2005-2013) 997 GT2, GT3 & GT3RS (2006-2013) Rear Upper Link Arm Outer Bush - PFR57-509 On some early 997 models (pre-2006) there is no support on the outside face of the link arm to hub bush. For these models use 4 x PFR57-508 for the link arm to hub bushes & 4 x PFR57-509 for the link arm to subframe bush. For hub carriers with support either side of the bush, use 8 x PFR57-509. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!