Lippert 281255 Bolt-On Shock Mount Kit  2.375" Axle 3.5K Bolt-on shock kit absorbs road shock and vibrations to provide a more comfortable towing experience Kit comes with everything needed to attach gas shocks to existing RV or trailer suspension utilizing a 2-3/8" axle tube Fits 2-3/8" axle tube 8.625" compressed length 13.5" extended length