Radio delete plate does not fit.

Sy
I have a 66 B-Cuda also. I am not putting the original radio back in...... So I made a plate out of black sheet plastic.
I made a paper tracing of the whole radio cut out, transffered it to the plastic. I made it fit into the round
"wings", and then I used 3M double sided body trim tape, and it fits in, and looks clean. My dash is black tho.
I cant take pics at present, cause the car is in its winter cacoon, and storage.
I got the sheet plastic off E-bay. It is 1/8th inch thick, and paintable.
The radio opening in my dash is just like yours.
Dave