Bumper. Left.2500 SERIES. Rear. Right.2500 SERIES. A component (mounted in the center of the Spring) which cushions the Spring as it is compressed. Rubber pad or block that contacts the leaf Spring when the suspension is over compressed. Used to prevent the control arm from making contact with the vehicle's frame. seat. Auxiliary. Coil Damper. Leaf. Stopper. Suspension Control Arm. Vibration Damper.