These front sway bar kits are designed as a performance replacement upgrade for your classic GM muscle car. They feature a 1" diameter solid steel bar and come with all hardware needed for a successful installation. If your Tri-5 Compatible with Chevy came with an anti-sway bar from the factory, chances are this kit will be a direct replacement. If it did not, a small amount of drilling will be required for installation of the sway bar kit. Achieve flatter cornering. Complements rear sway bar to reduce understeer and gain more neutral handing. Adds to cornering stability at speed. Solid steel 1" diameter bar. Includes polyurethane bushings for increased responsiveness. Black powder coated finish. Corrosion resistant zinc plated hardware included. Fits: 55-57 Compatible with Chevrolet Full Size and Station Wagon. 55-57 Compatible with Chevrolet Nomad Wagon. REAR SWAY BAR These rear sway bar kits are designed as a performance replacement upgrade for your classic tri-five Compatible with Chevy passenger car. They feature a 7/8" diameter solid steel bar and come with all hardware needed for a successful installation. If your 1955-57 Compatible with Chevy came with an anti-sway bar from the factory, chances are this kit will be a direct replacement. If it did not, a small amount of drilling will be required for installation of the sway bar kit. Achieve flatter cornering. Complements front sway bar to reduce understeer and gain more neutral handing. Adds to cornering stability at speed. Solid steel 7/8" diameter bar. Includes polyurethane bushings for increased responsiveness. Black powder coated finish. Corrosion resistant zinc plated hardware included. Fits: 55-57 Compatible with Chevrolet Full Size & Station Wagon.