I'm pretty sure the Europa was the standard radio for the 230SL... I just bought a used one for mine, since some PO had slapped a Sony or something in the hole. However, my dash does look like the opening was made by a real metal butcher, so I can't absolutely confirm that my opening is stock size
230SL, 59 Jag MK IX, 65 Stingray Roadster, 89 Carrera Cabriolet