Rear strut shock absorber assembly compatible with H3 models from 2006 to 2010.OE number: 911528.Interchange numbers include 911528 and 555050.The assembly uses damping oil tested for viscosity, density, and low-temperature function to consistency.Increased strut pipe thickness and spring weight contribute to structural integrity.Spring fatigue testing exceeds 600, 000 cycles.Installation dimensions match specifications for extension, compression length, and stroke.Dampers undergo 3 million fatigue cycles with no oil leakage and less than 20% damping force attenuation.Welded brackets endure 400, 000 cycles at 0.8 MPa tensile pressure.cover withstands 300, 000 cycles without failure.Rigid mount design helps reduce vibration and noise.Manufacturing includes multiple quality control checkpoints.Packaging uses environmentally friendly materials.