If you look on the cover of the latest VMX mag you'll see Gunters 400 with a KTM chain guide on it, I've fitted them to a few bikes now, there cheap as chips from KTM, piss off the spring loaded tensioner and run a T guide on the front of the swingarm.....Ive used a YZ85 guide on a RM125T aswell, just made some trick looking plates up for the sides.