My '56 CJ5 has extra spring packs over the rear axles (see images). I've been unable to find much info about them, but assume that they were an option for farm or other heavy duty use. I'm planning on replacing springs and shocks at the end of the year, but I haven't had much luck finding anything like the upper packs or the extended u-bolts that hold both sets of springs to the axle. I don't beat the jeep up so I probably don't need to replace the extra HD packs, but am wondering if it's safe to re-use the u-bolts. Anyone have these on their rigs? Any thoughts on replacing the main packs with new or NOS original style units and keeping the existing extras and re-using the u-bolts?