My recollection of the catalogue and my experience with other things on the Sprinter, i would say no to any accessories that would come with the radio. You order the wiring, you get just the wiring.
But then, your mileage may vary.
Jef
You went about that one the wrong way and your Canadian too.
All MB radios require an optional AUX in connector available from Mercedes.
With a retro fit you need the aftermarket X make to Mercedes mating loom