Hi BJ , in your article after you have taken the side vent out you take the black plastic backing plate off . On the other side you have to take the exterior painted vent of the backing plate to remove it (it's not really a backing plate on this side but the fixings are similar) there are two lugs at the top of the vent and one on the top and bottom slat . Ive put very crude arrows on this pic where they are ! If you start at the bottom lug and work up the top two should come out easily .