Bilstein is an original-equipment shock absorber supplier, and its B4 OE Replacement line is built to that same specification — this front strut restores the ride, handling and safety your BMW had when new, rather than changing how the car rides. It's built on a shared front strut that spans the 3 Series sedan and wagon, the 4 Series coupe, convertible and Gran Coupe, and the diesel 328d. Bilstein builds the B4 in the construction the vehicle left the factory with, so the replacement matches the original's behavior, not just its dimensions. This one is a twintube design, matching the factory front strut on this platform. Why Choose Bilstein B4 Built by the same engineers, on the same machines, in the same plants as Bilstein's original-equipment products Twintube construction, matching the factory strut's behavior on this platform Every B4 is validated in Bilstein's own road trials, not bench-tested alone Pre-delivery long-term endurance, salt-spray and scratch testing, plus a 1:1 functional check before it ships What's Included One Bilstein B4 OE Replacement front strut assembly (this part number is used on both sides of the front axle) Installation Notes Rubber-mounted strut attachments should not be fully tightened until the suspension is loaded with the wheels on the ground. Don't use an impact tool to loosen or tighten fasteners, and self-locking nuts should only be reused once. After installation, caster, camber and driver-assistance sensor aim should be checked and adjusted to the manufacturer's specification. Installation requires the tools and expertise of a qualified suspension specialist. Need a Different Option? Bilstein B4 OE Replacement rear shock absorber — the matching rear-axle shock for this platform. Product Specifications SKU: B009 22-220066 MPN: 22-220066 GTIN: 651860704203 Series: Bilstein B4 OE Replacement Product type: Suspension Strut Assembly Position: Front Internal design: Twintube Finish: Black paint Quantity per vehicle: 2 Boot included: No Frequently Asked Questions Do I need one of these or two?Two — this same part number is used on both the front left and front right. Will this change my ride height?No. B4 restores the factory ride and feel — it's a like-for-like replacement, not a performance upgrade. Who should install this?Bilstein states that suspension installation requires special tools and expert knowledge, and should be performed by a qualified suspension specialist.
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