well just found out that yakima says that the q towers have to be 25in apart. which means that you can not use most yackima boxes. I had a space case for years to find out I cant use it. yet you can use the case with the cross towers. yet you loose he weight ability of 65lbs. so I new have to buy an new $300+ box. I'm thinking of fabing something to allow me to use it any way with metal reinforced frame.