For those of us with very long legs and very short backs, the stretch to the OEM bars is a stretch too far.
I had the Helibars on the K12S and swapped them onto the K13S when I upgraded despite the grip location holes being different...
For me, they make the stretch do-able but it still isn't comfortable or ideal. I also have foam grip puppies which add thickness and as they say 'every little helps'.
With my current incapacity I am convinced the K has to go to someone who needs a continent crushing ballistic cruise missile, in dark black.