1964-72 GM A body, , , , , 1968-69 F-Body / and 1968-74 X-Body, - Factory Correct Front Lower Control Arm Bumper - Pair These are the bump stops that bolt to the front lower control arms and use the frame as a stop if the control arm is bottomed out. With out these the control arm will hit the frame and bend when bottoms out. These are often blown out or dry rotted and cracked from years of use. This is inline tube Exclusive Factory Bump stop. This is a rubber part with a metal core. These are exact to the factory originals. If you are building a concours car this is a great detail item that is usually overlooked. They are always blown out or distorted.