This is the main support hanger that does two jobs. Hangs and supports the exhaust system and clamps the tailpipe to the muffler as well. The 5/16 bolt secures the main support hanger to the floor pan bracket which is mounted on the floor pan of the car. If the floor pan bracket is missing a universal replacement kit #ACC4001 is available. Our hangers and floor pan brackets can be used on right or left sides of the car.