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Wire Sets by ACDelco. Details:Maintain your Chevrolet Buick GMC or Cadillac vehicle with a Genuine GM Spark Plug Wire Set. This set consists of a group of wires encased in an insulating material as well as connectors and insulating boots. They transfer high voltage pulses between the voltage source the distributor and your vehicle’s spark plug. Only Genuine GM Parts are tested to meet GM Original Equipment standards and are designed specifically to fit your vehicle.