I have some CRGs. You can mount them to the bar directly on longer aftermarket bars, but the stock bars are very short and there isn't room.
What you want is a bar end adapter that replaces the OEM bar ends and internal weights. I used Motovation because they are weighted to retain some vibration dampening that you lose by removing the stock weights and the outer part is made of Delrin so it doubles as a slider. Any cheapo ebay bar end adapter will work, though. The Motovations are expensive.
Here you go! Apparently CRG themselves make some cheap ones.