Only the size is a standard. Mounting methodology is not, as far as I know.
Are the holes on the side of the case supposed to be double din ISO standard?
Meaning, I unbolt my factory radio and use the factory screws and brackets to install the blackbox case?
Is just the double DIN size a standard, and you need to drill holes in the case to mount it?
I had to drill new holes for mine to mount it in my Toyota Yaris double din space.
I also found that the front piece around the screen was slightly larger than double din and i had to do some adjustment to the dash so i could mount it flush instead of hanging out the front.