49-51 MERCURY FRONT COIL KIT - KIT INCLUDES: DROP COILS, MATCHING SHOCKS AND UNIVERSALE LOWER BUMP STOPS. AT JAMCO, WE MANUFACTURE EACH SET OF SPRINGS TO THE SPECIFICATIONS OF YOUR VEHICLE. WE ARE NOT SELLING A "ONE SIZE FITS ALL" SPRING. ALL OF OUR SPRING ARE MANUFACTURED WITH A 30% STIFFER SPRING RATE TO SUPPLY YOU WITH A LOWER COIL AND MUCH IMPROVED RIDE. BILSTEIN SHOCKS ARE AN AVAILABLE UPGRADE IF YOUR LOOKING FOR AMAZING RIDE ** PLEASE ALLOW 2-3 WEEKS FOR DELIVERY**