These rear sway bars are designed as a performance replacement upgrade for your classicCompatible with Ford muscle car that came with a factory installed sway bar. They feature a 7/8" diameter solid steel bar and come with all additional hardware needed for a successful installation. If your classic Compatible with Mustang came with an anti-sway bar from the factory, chances are this kit will be a direct replacement. If originally equipped with a sway bar, the original hardware will need to be re-used, along with the additional supplied hardware. These sway bar kits should only be used when the vehicle has a factory installed swaybar. 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: 1971-1973Compatible with Ford Compatible with Mustang, Compatible with Mustang II, Compatible with Mustang LX, GT. 1971-1973 Mercury Cougar.