Rear Strut and Coil Spring Assembly compatible with Cutlass Supreme (1998–1999), Am (1999–2005), and Alero (1999–2004).Fits vehicles with 2-3/8 inch spacing between lower mounting bolts. Interchange Numbers: 1332307, 171686, 22064732, 2701248735, LS56928, SR4037, 15130, 55S15130, 812071, ST8551, 33GM1108, G56928, 92140160, LS5390082B Features: - Damping oil formulated for stable function within a temperature range of –40°C to 80°C - Laboratory tested for viscosity, density, and low-temperature function - Strut tube wall thickness and spring mass conform to dimensional specifications - Spring fatigue tested for over 600, 000 cycles - Installation dimensions match specifications - Extension and compression travel match factory rear strut stroke length - Shock absorber units undergo 3 million cycle fatigue testing with no oil leakage; damping force attenuation does not exceed 20% - Welded mounting brackets tested under 0.8 MPa tensile pressure for 400, 000 cycles - Boot tested through 300, 000 cycles without failure - Includes rubber isolation mount to reduce vibration - Manufactured with controlled material sourcing and seven in-process quality checkpoints - Packaged using recyclable materials Please verify your vehicle's year, make, and model against the listed compatibility before purchasing.