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I made these. I have insulating foam sleeves over the coolant tubes, so I made the "openings" about half the difference between the OD of the tubes and the OD of the foam. Wrapped the foam in tape in the area where the "clamps" are located so they don't eat into the foam. These don't actually clamp the tubes rigidly to the chassis, but they keep them from shifting side to side, and once the coolant lines are connected at each end, they can't shift forward and back either. I put a set at the front and a set at the rear.