Mazda MX-5, Miata, Eunos Mk4 ND (2015-) Front Lower Arm Rear Bush Insert - PFF36-605 PFF36-605 is an insert that fits into the voiding of the original rubber bush to stiffen. For a full replacement, please use PFF36-602. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!