I have been very pleased with my Mountain Addiction gas cans. There is 2 plastic extrusions that mount to your tunnel and a notch in the bottom of the cans that allow them to slide off and on the extrusions. They dont move and you dont have to strap them, they come in a variety of colors and they even offer a storage container that slides off and on the rails. It will be tough with the 136, unless you have a little bit longer than stock factory tunnel extension. http://www.mountainaddiction.com