As far as the gasket if you find out that Ben Breitner is making those please let us know. I’m not on Facebook. nymarine.ca has them. Pricey but probably well made and nobody else does them, as far as I know…except maybe Ben.
Some use various rubber trim to make them if you don’t care about being original and just want something to cushion the face plate up against the inside of the cover and prevent rattling. I tried one using bottom edge guard. And another one, I took 1/16″ rubber sheet and used the face plate as a template and cut out a piece and attached it to the front of the face plate with Seal All.