DROP THE TAILGATE
THERE ARE 2 SCREWS ON THE SIDE.
UNDO THOSE SCREWS THE TAIL LIGHT COMES OFF
THEN UNDO THE SOCKET FOR THE BULB|||On my silverado i have to drop the tailgate to access the mounting screws. On the inner side of the tail gate are to bolt that hold the lens in. Usually an allen wrench or one of those starshaped security keys are required.