Bilstein 205-320-43-30 B4 OE Replacement Rear Left Air Suspension Spring

The Bilstein 205-320-43-30 is a B4 OE Replacement rear left air suspension spring engineered specifically for Mercedes-Benz C300 models equipped with the factory semi-active air suspension system (suspension code 489). As a genuine OE supplier for Mercedes-Benz air suspension components, Bilstein manufactures this spring to the same standards as the original factory part.

The B4 OE Replacement series is purpose-built to restore factory ride quality, handling, and comfort. Plug-and-play compatibility means this spring connects directly to the vehicle's original electrical and pneumatic connectors without modification, making installation straightforward and returning the suspension system to proper OEM operation.

Key Features:

• Direct OE replacement for factory Mercedes-Benz air suspension systems
• Bilstein-quality engineering meets or exceeds original manufacturer standards
• Plug-and-play fitment — connects to original vehicle connectors without modification
• Restores factory ride height, handling balance, and comfort
• Designed specifically for vehicles with semi-active air suspension (Code 489)
• Compatible with suspension codes 805, 806, and 807

The Bilstein B4 air suspension spring is the ideal solution for replacing worn, failed, or leaking OEM air springs on the Mercedes-Benz C300. Bilstein's legacy as a factory OE supplier ensures this component delivers the precise damping characteristics and durability expected from a premium European vehicle.