Bilstein B4 Rear Shock Absorber | OE Replacement | BMW 3 Series E21 315-323i & ALPINA B6/C1 (1975-1984) | Gas-Pressure Twin-Tube | Rear | Part 19-019802

Bilstein B4 Rear Damper for BMW E21 and ALPINA B6 C1 - Part 19-019802

Bring your classic 3 Series back to its best with the Bilstein B4 rear damper, part number 19-019802. This OE-spec suspension unit is engineered for the BMW E21 and ALPINA B6 and C1, delivering the balanced comfort and stability enthusiasts expect from a factory-correct replacement. With Bilstein’s pressurised gas twin tube construction, you get consistent control, confident road holding and a composed ride on UK tarmac.

We run these on our own cars and customers repeatedly tell us the transformation is immediate: tighter rear-end control, improved stability over bumps and a fresh, precise feel that suits a daily-driven classic or a cherished weekend machine.

Why it belongs on your E21

• Direct-fit rear suspension unit that matches original equipment characteristics
• Gas pressure technology keeps damping performance consistent under load and at speed
• Twin tube architecture for durability and comfort that feels factory fresh
• Confident handling, strong traction and reassuring stability on British roads
• Ideal for restoring the original ride quality on classic BMW 3 Series E21 and ALPINA applications

Key highlights

• High safety reserves for composed braking and cornering
• OE-level quality from a trusted German manufacturer
• Stable damping characteristics across varying loads
• Engineered for precision, comfort and longevity

Technical details

Vehicle fitment

Made to replace the original rear damper on the following models:

ALPINA

• B6 E21 2.8 - 03.78 to 03.83
• C1 E21 2.3 - 03.80 to 07.83

BMW 3 Series

• E21 - 06.75 to 03.84
  • 315, 316, 318, 318i, 320, 320i, 320/6, 323i

Fitment check

We will confirm compatibility before dispatch. Add your UK registration or the last 7 of your VIN at checkout and we will verify that 19-019802 is correct for your car.

Professional fitting

Want it installed by specialists who know classics and performance? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

Buy with confidence

Enthusiast tested and customer approved. This Bilstein B4 rear damper brings back the crisp, controlled feel your E21 deserves while maintaining the comfort and originality that make these cars special.

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