Yeah that link is what I use. Simple enough to fit and works well.
MDI units are a pain the back side. They need constant firmware updates and specific leads for different versions of apple/android phones and even then there's no guarantee they will work...and that's before we even get to the issue of the RNS units not displaying album art properly etc etc. Forget that route. Just get a phone mount and a little Bluetooth dongle that plugs into your AUX in. Works a treat and considerably cheaper.