My 850 Turbo Wagon has had an alpine 611 changer under the Passenger seat (I use the freight compartment for bulky loads). It needed diverting the under-front-pass seat airvent to avoid heat on the changer. The alpine dealer knew where to get the adapter so the the SC-811 head handles all the controls just like the factory, but at less than half the price.

It was an SC-810 before core switch for repair resulted in update/upgrade. It worked with both in either event.