I have this one, to hold a flashlight similar to yours in dimensions, a 1*18650 led light. It holds things nice and tight so the flashlight doesn't dip, even barrelling over cobbles or whatever. It would be perfect if the hardware was stainless instead of painted black regular steel, but as is it's pretty good and it only costs a few bucks.
http://www.dealextreme.com/details.dx/sku.15642