SPL Parts 2016+ Mazda Miata (ND) Rear Knuckle BushingsThe Rear Knuckle Bushing Kit for the ND Miata provides you with a smooth articulating, deflection and compliance eliminating solution to take all of the "street car" mushiness out of the rear of your suspension. The rear knuckle bushings in the ND Miata are rubber injected bushings with metal sleeves in them. While this does provide for a compliant ride, this is not what you desire when you are pushing the vehicle to it's limits. When pushing the car