So as per my research, the topcase that Kawasaki sells for C14 is actually a Givi Monolock. I have one of these and am planning to bolt a backrest onto it so my girlfriend can be more comfortable while we ride. Givi sells the E110 backrest which is supposed to fit this topcase.

The reviews I've read online make it sound uncomfortable. Does anyone have any experience with these? My topcase already has the holes drilled on it so I assume it had this backrest pad at some point.