SOMEONE MADE THAT AS ITS NOT OEM
must support a special radio as thats where it is on the face
as most radio back mounts are a bolt in the center
I can’t confirm that it isn’t OEM, but it is purpose built for the coupe and definitely not a DIY bracket. Take a closer look at what is going on with the bracket, the precision of the bends, the depression, and the alignment with factory bolt holes. It took serious equipment to make, and it is plated post fabrication.
Sadly there are very few pictures of factory radio setups. The blue book has nothing on factory radio installs on an AC car.