Install Kit - Motorcycle Audio Accessories | V-Twin Audio & More is probably the cleanest and you can get the splash cover. Otherwise I believe Biketronics, HawgWired, Scosche have them too. Just not as clean looking.
Interface - Biketronics, HawgWired or Scosche here as well. This is what's needed for hand controls. The Biketronics has options to mute OR avr. Not sure about the others.