I transferred a set of ThrottleMeister bar ends from my '05 Concourse to my '08 FJR using the FJR kit that I bought from them without much problem. Regardless of whether you get the kit or a whole new TM setup, they are a bit fiddly to get them adjusted "just right" so that the throttle locks fully when the TM is engaged and also moves freely when not engaged. In fact, I need to adjust mine again since it slips a little at speed and allows the throttle/speed to reduce. If you really don't need/want the TM on the other bike, I'd recommend getting the FJR adapter kit. The other thing to consider is the color and condition of the old TM bar ends. If they are scratched up due to a dump, then new ends would look nicer - your call.