The tubes are adjustable and there is a set screw that locks them in place. That is the little dimple that you see sticking out the bottom about 3 inches forward of the bend. To adjust the width, you need to loosen two bolts and spread the side tubes apart and then tighten the two bolts again.
The one I have on my GL1200 is spread almost as wide as it gets, and stretched almost as long as it gets and I can still safely lift on it to get the bike on the center stand.