One of my original shackle bolts has gone missing and I'm seeking a replacement. I've tried the route of ordering a shackle kit but those bolts are too short or, in other words, the bushings are narrower. I'm replacing the original bushings with Energy Suspension Polyurethane bushings #3.2103R, which are correct in size with the originals. The original bolt, which has a head like a carriage bolt, is 5 5/8 - 5 3/4 inches long. Does anyone know where I can find a replacement?