Bilstein 21-030420 BMW E21 B4 OE Replacement Front Shock Absorber
Restore your classic BMW E21 with the Bilstein B4 OE Replacement front shock absorber, part number BILSTEIN-21-030420. This front strut insert is engineered by Bilstein for true OEM ride quality, stability and safety. If your BMW 3 Series E21 feels tired, bouncy or vague, this Bilstein B4 gas pressure shock is the direct-fit solution that brings back factory-fresh control and comfort.
Perfect for daily driving, restoration and MOT-ready maintenance, the Bilstein B4 front shock for BMW E21 delivers precise handling, confident braking and consistent damping. It is the ideal OE replacement shock absorber for owners who want reliable performance without harshness. We run Bilstein B4s on our own cars and our customers consistently praise the smooth ride, improved control and OEM-level durability.
Why choose Bilstein B4 for BMW E21
- Direct fit OE replacement front shock absorber for BMW E21 3 Series
- Bilstein gas pressure technology for constant damping under load
- Twin-tube design tailored to this application for durability and comfort
- Restores original ride height characteristics and factory feel
- High traction, precise handling and maximum safety
- Premium OE quality from a world leader in suspension
Key specs and fitment details
- Fitting position: Front axle
- Shock absorber design: Suspension strut insert
- Mounting type: Bottom plate, top pin
- System: Twin-tube
- Type: Gas pressure
- Strut outside diameter: 45 mm
Compatibility
BMW 3 Series E21 models:
- 3 Series E21 06.75 - 03.84
- 315, 316, 318, 318i, 320, 320i, 320/6
Keywords: BMW E21 front shock absorber, BMW E21 front damper, BMW E21 front strut, Bilstein B4 BMW E21, Bilstein 21-030420, BILSTEIN-21-030420, OE replacement shock, OEM quality shock, classic BMW 3 Series suspension, E21 suspension upgrade, E21 shock absorber replacement, front shock insert 45 mm, bottom plate top pin.
Compatibility check
We will verify fitment before dispatch. Provide your UK registration or the last 7 digits of your VIN at checkout so we can confirm compatibility for your BMW E21.
Professional fitting
For hassle-free installation, book fitting with Nforcd in Warwickshire. Request a quote at Sales@nforcd.com.
Tip: For best results and balanced handling, we recommend replacing shock absorbers in axle pairs.
Part numbers and identifiers
- Manufacturer: Bilstein
- Part number: BILSTEIN-21-030420
- EAN: 4025258430771
- UPC: 651860430775
What you get
1 x Bilstein B4 OE Replacement Front Shock Absorber insert for BMW E21 3 Series, designed for direct-fit installation and OE-spec performance.
Make your BMW E21 drive like new
Choose the Bilstein B4 21-030420 for your BMW E21 and enjoy confident steering, improved ride comfort and stable, predictable handling. Add to basket now for a simple OE-quality suspension refresh.