I have a 2000 GMC stepside, of course the bed is smaller since it is a stepside and i cannot find a toolbox small enough to fit in it. i know they make them , i just cannot find them anywhere. my bed measures roughly 48 inches in width. the smallest toolbox i can find is 52 inches. i can find the boxes that dont hang over to fit in it, but i would like a slim fit box that hangs over the sides. can anybody help?