Welcome Paul. What is your question?

Actualy I have 2 questions, what goes on the brackets in the picture, I'd guess some sort of panel but how big should it be. Also inthe middle buy the rear view mirror theres a 1 inch hole and a couple smaller screw holes, what the heck mounts there or do I halve the wrong rear view mirror.

The optional radio speaker goes on the brackets. There may be a wire there just in case. There's a picture at web page: . st.lowrider.com/uploads/sites/7/2018/11/1937-Chevrolet-Master-DeLuxe-Headliner.jpg .
The hole near the front may have been for an antenna that would rotate out of the way. It was not an option on the 1937 - 38 Fisher "A" bodies. This is only a guess. Lou

This is the picture Lou pointed out: <CLICK>