New Addition. Here are my installation instructions for a Rostra Cruise on a 2012+ Stelvio NTX with ABS. Any questions please let me know.
Revision: Added details on waterproofing the switch and notes on possible rear seat interference. My Bike has a Corbin seat which sit higher in the rear. You may have interference with the top of the unit and the bottom of the seat pan on a stock rear seat. From someone else that used the same location, they reported a 1/4" clearance issue. They cut a relief hole in the bottom of the seat pan, but I believe that you could just add some spacers to the bottom of rear section. The locking pin for the seat is adjustable, I just don't know if you have 1/4" of adjustment.