[numpad0]

Every cars produced from 1970s until yesterday afternoon have one of that kind of standard mounting, colloquially called 1DIN and 2DIN form factors. It's the shape of old car radios and cassette player front panels. If you've ever wondered if it's actually removable or it's just such an extremely uniform and coincidental choice of aesthetics, it's actually a standard slot. And there are endless aftermarket options. Very few cars lacked support for it, but it's since been de facto deprecated and being replaced by Android Auto and Apple CarPlay.

> 1/4-20 UNC

ISO M8.