Bilstein B4 DampTronic Rear Left Twintube Shock - BMW X5 (G05) / X6 (G06) 2019-2026

The B4 OE Replacement (DampTronic) is Bilstein's service replacement damper for BMW chassis that left the factory with electronically adjustable suspension. It retains the original electronic damper interface, so the vehicle's adaptive damping system keeps full function after the swap. Valving comes from Bilstein's OE development work, which holds the damping force range inside what the factory control unit expects and restores original ride quality and handling instead of firming the car up. The damper is a gas pressure twintube finished in black paint, with a stem upper mount and a 14.1 mm eye lower mount, measuring 356.0 mm collapsed and 482.3 mm extended. Spring seat and boot are not included.

Specifications

Documents: Installation Instructions (PDF)  |  Safety Data Sheet (PDF)

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy