Bilstein B4 Front Shock Absorber / Strut Insert Damper Cartridge for BMW E28 5 Series (518 518i 520i 525e 528i 533i 524d 524td) & E24 6 Series (628CSi 633CSi 635CSi) OEM Spec OE Replacement MacPherson | 21-030512

Factory-spec Front Damper Cartridge for BMW E28 and E24 - Bilstein B4 21-030512

Bring your classic BMW back to its best with the Bilstein B4 front strut cartridge, part number 21-030512 (BILSTEIN-21-030512). This is a direct-fit front suspension insert for BMW 5 Series E28 and 6 Series E24 models, delivering the original balance of comfort, steering precision and stability that enthusiasts expect. If your front end feels tired, floaty or bouncy, this front damper is the proper factory-spec solution that restores confident road manners without altering the car’s character.

We run these on our own builds and our customers consistently report a smoother ride, tighter front-end control and predictable handling in all weather. It is a superb choice for daily use, touring and maintaining originality on cherished BMWs.

What makes it a great choice

• True OEM-grade replacement for the original front strut insert on E28 and E24 chassis
• Pressurised twin tube design for consistent damping and dependable road holding
• Excellent body control under braking and cornering while retaining factory comfort
• Built by Bilstein for durability and long-term reliability
• Ideal for standard ride height road cars seeking a proper suspension refresh

Key details

• Position: Front axle
• Type: MacPherson strut insert
• Construction: Twin tube, gas pressurised
• Mounting: Bottom plate with top pin

Vehicle applications

BMW 5 Series E28

• 518, 518i, 520i, 525e, 528i, 533i, 524d, 524td

BMW 6 Series E24

• 628CSi, 633CSi, 635CSi

Fitting and setup

Professional installation is recommended to ensure correct assembly and alignment. For expert fitting, choose MJ Modifications in Warwickshire. Request a quotation at info@mjmodifications.co.uk.

Check compatibility before dispatch

We will confirm fitment prior to shipping. Please supply your UK registration number or the last 7 digits of your VIN so we can verify you receive the correct front damper insert for your E28 or E24.

Identifiers

• Part number: 21-030512 / BILSTEIN-21-030512
• Manufacturer: Bilstein
• EAN: 4025258430887
• UPC: 651860430881

Helpful tips

• Replace in axle pairs for balanced performance and even wear
• Inspect springs, top mounts, bearings, gaiters and bump stops during installation

Search terms people use

BMW E28 front damper, E24 front strut cartridge, BMW 5 Series E28 suspension insert, BMW 6 Series E24 suspension parts, Bilstein 21-030512 front shock insert, BMW E28 shocker front, BMW E24 shocker front, front suspension refresh BMW classic, BMW 528i front damper insert, BMW 525e front strut, BMW 520i E28 front suspension, BMW 635CSi front shock insert, BMW 633CSi front damper cartridge, BMW 628CSi shock insert, BMW 524td front suspension, BMW 524d front damper, E28 MacPherson strut insert, E24 MacPherson strut, OEM spec BMW front suspension, Bilstein B4 damper cartridge, factory ride quality BMW classic.