So your new light will not fit back on the stock plastic mount properly. This is due to the mounting points (in the red circle and green box below). The mounting point in the green box is on the factory center. As you can tell by looking at the one in the red circle it sits lower and this causes your light to not click in place properly. I removed the mounting point in the red circle with a dremel tool (any cutting tool will work). The light will still securely fit after this is removed so dont worry about it being loose.