Nothing is a heavy as the stock bar ends....all the aftermarket ones I've seen are very light...this increases vibration on the handle bars...unless you fill them with lead bb's or find someway to increase their weight...at least from the other discussions on bar ends that's what I understand..

The bar ends in your picture don't look like the ones for a kat unless you can remove the rubber things...you should have a straight screw that goes into the bar ends...take one of your old ones off and you can see it...