The K1600B has crash (tip over) bars under the forward footboards. The crash bars can be added to the GTL and GT. Anybody that gets a GTL or GT without the bars is probably making a big financial mistake. Even if you are not moving when it goes over you are going to be paying a big bill. The mirror will hit the ground, and just the small front cover on the mirror assembly is about $145. There will be other damage as well.
The footboards will fit on a GTL or GT also, but are not usable unless you have rubber legs and can bend your leg around the side compartments which the "B" model doesn't have.