You are right... they are actually called "Frame Sliders" to protect the frame. It just so happens that it protects the plastic some.
Most of the time the F.Sliders mount where the top of the motor mounts to the frame. Sometimes, those bolts are behind the fairings. When this happens you can either "cut" a hole in the fairing so the sliders stick out.
When this occurs some people really hack the hell out of their fairings... therefor creating a market for a easier and cheater way of doing it.
Mount a bracket on the frame to move the actual mounting point for the frame slider, so that you don't have to cut the fairing.
The problem is that the "bracket" can act as a lever in a crash, bending and actually pulling on the frame mount and damaging it!
Hence the reason why many of us don't like the "no-cut style"
aka Gas Man
Was: 2002 Kaw ZX-9R
is me till the