Hi, I’d like to install a Bluetooth hands-free device and a navigator in my C70 convertible, or a double DIN device with Navi and corresponding interface to the iPhone. The hands-free device should best be combined with the radio speakers. To do this, I found a device from Yatour, which should work via the input of the external switcher. Did someone do that? How do you get the SC-901 out of the shaft? Or should I go straight to a double DIN device? Does this even fit without any problems? Do you need a special aperture? What should you invest?