I want a new plate because the screw holes on the original have plastic inserts that are striped, and the 5" bring that is suppose to seal it is not available. So to seal it I need to use good adhesive to seal it down, then it is a project to see if I have water leaking in.
Armstrong makes a nice plate , designed for brackets that is easy to seal and unseal without the use of tools. 8" is their smaller size.