These Xterra u-bolts are 1/2" Grade 8 rod zinc plated w/ Grade 8 nylock nuts for years of good looks and plenty of strength and ease of service. These are typically long enough to use with Alcan or OME springs too. These do fit closely through the stock spring plate, so a bit of finagling might be needed to make them fit. We do this to provide the maximum strength bolts with the stock mounts. These u-bolts will work with stock srpings too, but the excess length will need to be trimmed.