ARB Bp51 Fit Kit Jeep JK 4In Rear WHY ARB ARB's Old Man Emu (OME) and BP-51 lines are tuned by ARB engineers in Australia for predictable handling under load — empty, loaded, or towing. BP-51 internal bypass technology delivers premium damping with zero-fade performance over washboard, sand, and rock. KEY FEATURES Spring Fitting Kit Vehicle-Specific FITMENT 2007-2018 Jeep Wrangler JK ⚠ CA Prop 65 Warning