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Buick GL8 ES 3rd Gen 17+ SGM258 Coilovers - TSD Performance Keeper Springs (Helper Springs):Yes I do - Please add Keeper Springs ($200) Max speed while driving pressurizedBuick GL8 ES 3rd Gen 17+ SGM258 TSD Performance TSD provides the highest quality matched with affordability. Street and Track Proven. Options for sea and air freight are now available! We are providing ORDER IN Coilover options for over 1,000 popular makes and models. 53mm OD threaded mono tube nitrogen oil damper Large cylinder and 44mm piston 32 damper settings High quality SAE 9254 powder coated motorsport coil PU bump stop and dust boot Adjustable