TuningPros LS-057-B Lowering Springs Kit Blue Set of 4 Color: Blue; Lower rate: 1.0-Inch Front, 1.0-Inch Rear ; Spring rate: 230F & 205R Constructed from Japan SAE 9254 cold wounded steel; Corrosion-Protected with phosphate and powder coatings Spring rates specifically tuned for handling and comfort; Provide exceptional response, control and balance Sold as a complete set of 4 springs; Compatible with OEM stock or aftermarket shocks Custom fit for your vehicle; This part is guaranteed to fit: Pontiac Grand Prix 1997-2006