Mazda MX-5, Miata, Eunos Mk2 NB (1998-2005) Rear Diff Mounting Bush Insert - PFR36-121 This part is an insert to fit into and fill voids in original bush. For a replacement bush use PFR36-120. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!