This rear air spring bag set is compatible with W211 platform vehicles equipped with four-corner air suspension.It fits the rear left and right positions on E550 models from 2007 to 2009.The set includes two air spring bags designed as direct replacements for the rear air springs. Compatible with OEM part numbers: Left side: A2113200725, A2113201525, A2113201325, 2113200725, 2113201525, 2113201325 Right side: A2113200825, A2113201225, A2113201625, 2113200825, 2113201225, 2113201625 Each bag features a sealed construction with three mounting pins.Dimensions: Left: 14.6 x 6.3 x 5.9 inches (37 x 16 x 15 cm), weight: 2.77 lbs Right: 13.8 x 6.7 x 6.5 inches (35 x 17 x 16.5 cm), weight: 4.1 lbs Operating pressure: up to 290 psi.Material: natural rubber.Temperature range: -40°C to 70°C.Air tightness tested at ≤0.02 MPa for 24 hours. Fits W211 sedan and wagon models with full four-corner air suspension.Does not fit wagon models with rear-only leveling suspension.Not compatible with S211 Estate self-leveling suspension. Professional installation is recommended.Confirm your vehicle's OEM part number and pin configuration before purchase.