Mazda Radio Cover
This is a Mazda expandable sound system radio cover. It should fit many double-DIN Mazda radios from the 2000's, including the Miata and MPV, which is where I tested it. It's blank so not very useful. I assume most people will modify it for other uses.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/k2oO9mWgfDq