Allows for access to enter the vehicle Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE) GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type GM regularly updates production and service part designs to integrate new materials and technologies Collision parts are designed to help promote proper and safe repair