You have to cut away the rubber from the throttle grip, there are also some small raised bits under the rubber that need cutting away. The OEM gross are also about 10mm longer than the Yamaha grips. It took me half an hour to do the throttle grip, the L/H grip just slides on. Wiring into the power supply behind the headlight. Working spot on and look way better than the KTM afterthought !
I actually bought a spare set of ktm grips off of fleabay so that I have the originals, always like to be able to put my bikes back to original spec.