I put the new rear rack on my K12S. Looks nice. Strong. If you put one on, make sure that you stay deep in the torx bolts holding the old grab rails in place as you turn the ratchet. The screws have locktite holding them and I almost had to resort to extrordinary means to get one out. You can't heat them very well to break the locktite.
Anyway, it's nice. Looks like a K1300S now...heh.