nothing on the current market'll do i don't think. current aftermarket offerings bolt to mounting points on the frame that the s4r doesn't have. might have to wait a while for something to come up...
unless next years' monsters follow suit, you may be SOL. i dunno if many companies would spend the R&D $$$ to come up with a bit that's only applicable to a single model.
so if the money's burning a hole in your pocket, get the full termi system
How about this,
No rear sets are available for your S4R, so send that money(or some new rear sets) on this way to help out this college kid supporting a ducati habit, for his M750 .
........ Just a thought...... Anyone know of a Ducati scholarship?