I'm trying to install upper and lower grills. I'm guessing I need to drop the front bumper. I'm not quite sure how to accomplish this. I do have a trim removal tool and removed many of the fasteners on the front clip. However, it still seems to be attached fairly well. After removal of some upper trim pieces I seem to have access to the upper grille and I could remove it however there are some rivets on the top holding it in place. I'm not sure what the proper procedure is to release the rivets without damaging the rivets or the grill. My black grills did not come with instructions or fasteners.