Oh I see the problem your having. Most likely you will have to stretch the double clamp, to do this grab a one dollar coin (works best) and place it where the two screws should enter the two holes to tighten, Tighten them so that they tighten against the dollar coin and stretch out the double clamp abit. Leave it for.... like 5 or 10 minutes, and you will have a stretched clamp that hopefully will fit onto the bars.
If you don't understand anything just let me know