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Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts OE or ACDelco Professional ACDelco GM Original Equipment parts are designed engineered and tested to rigorous standards and are backed by General Motors. GM Engineers design and validate OE parts specifically for your Chevrolet Buick GMC or Cadillac vehicle GM regularly updates production and service part designs to integrate new materials and technologies Replacing the Accessory Switch on your vehicle The ACDelco 84942074 is a direct replacement with the fit of an Original Equipment part.