Timmy:If you look closely at the brackets, you will see that they are actually formed from flat stock, bent into the square or rectangular shapes, and have a couple of small tabs bent over where the beginning and end of the sheet metal straps are. This is near where the bolt holes are. By bending those ears up a little, you can open up the metal straps to change the grommets and/or the wires. Squeeze them back together and bend the ears back down when you are through.
John in Selma, IN