The UMI Performance G-Body Rear Coil-Over Shock Kits are designed, manufactured and tested in the USA using US materials. With three coilover spring options available these kits allow you to transform your 1978-1988 GM G-Body car into a street, drag race or autocross terror. There are also kits that include rear control arm relocation brackets for additional adjustability. All kits bolt into existing mounting points allowing you to return your car to the stock configuration at any time. UMI Performance G-Body Rear Coil-Over Shock Kits include; powder coated laser cut 3/16 inch steel brackets, Viking 19-way adjustable shocks, 2-1/2 inch coil-over springs, all necessary hardware and detailed instructions.