Your looking in the wrong places, you need to call some heavy duty truck parts (Big Rigs) places. Most of them have u-bolt bending machines and can make just about any size. They will want to know the outside diameter of the bar and the length. The proper way to measure length on a u-bolt is from the inside top to the end of a leg. They will also provide you with the nuts and washers to match their u-bolts.