I purchased a top oven electric heater element from your company today item # AP2031031.The old one I think is held to the back wall with 2 screws in a metal bracket.How do I install the new one, do I unscrew the old metal bracket in order to get the damaged unit out and replace it with the new metal bracket that comes with the unit. I hope I do not have to take the entire oven out of the wall to get to the back of it in order to replace this piece.Please advise.