I didn't need anything additional, but did take the original barends out. Once removed, there are 2 different expanding bits (sort of like concrete anchors) for different sized bar diameter (ours takes the smaller one) and 3 different spacers to set the distance that works best. On the clutch side any would work but on the right side I used the most narrow and it still touches the brake lever, but barely (I'll take a picture tomorrow). Obviously the bike looks better without them installed, but it's honestly a 10 to 15 minute job to swap the guards back out and reinstall the bar ends, so economically I think it's a good solution. Once the heated grips are out I'll probably add those, too, but these are serving me well so far.