I read on Monsterparts that these handgrips are shorter than stock. What does that translate to in terms of installing these?
they fit. What the 'shorter' means is they won't reach all the way to the end of the bars, so you will have a small gap between the end of the grip and the end of the bar.
You can either cut the bars or grind off the locating pin on the controls and move everything outboard to fill the gap.