I'm finding this photo in the link provided by Trevor to be a good guide.
And here is a render of the dimensions on the cardboard template ... although I did change the large corner radius from 3/4 to 1/2 ... the larger dimension seemed too big. Sorry I didn't use more contrasting colors ... and it's trimmed down to be the exact same size as the photo above ... so hard to see the radiuses.
I overlayed them and they seem very close ... if I can verify the widest point, and the height, I can use the photo of the radio bezel as template for the CAD drawing.
I've got a couple other members helping me out with nailing down the dimensions too.