Here's a quick update on this.
I called the dealer back, apparently they wont install *any* Kuryakyn grip because of legal issues, he says they all suffer the same problem, left grip comes loose. There apparently was a lawsuit (shocking!), and this particular dealership served as a consultant.
So I called another dealership, same thing wont install any Kuryakyn grips. Says that the HD grips too can come loose, but they have (not sure if I'm paraphrasing correctly) a flange of some sort which prevents them from coming completely off, and said it would be easy for Kuryakyn to do the same thing.
This person (service manager) says he's not a fan of *any* HD heated grip because of reliability problems, he's getting Heat Demons for his own ride.
So there you have it, sports fans....