Ditdater is this what your looking for? That piece was on the dash of my 66. It was pop-rivited over the top of the large hole. The radio that was in it wasn't a stock one and the piece is made out of aluminum. I'm going to hang on to it until get the dash fixed the way I want it.
https://vintage-vans.forumotion.com/t2900p15-project-route-66-banana
https://vintage-vans.forumotion.com/t2900p15-project-route-66-banana