Bilstein 21-030390 Suspension Strut Cartridge - Front
OE Quality 60-Day Returns
Bilstein
 B4 OE Replacement

Bilstein 21-030390 Suspension Strut Cartridge - Front

Brand Bilstein 21-030390
Position Front
Boot Included No
Finish Black paint
Internal Design Twintube
Lower Mount Type Housing
Series B4 oe replacement
Title Bilstein shock absorbers
Upper Mount Type Stem
Product line B4 OE Replacement
Fits Audi · 33 vehicles

OE replacement. Restores original ride quality and handling.

Twintube design. Helps maintain consistent damping performance.

Black paint finish. Adds a clean, durable protective coating.

Cross-references KYB 366002, 4A0 413 031 and 4A0 413 031 D for the same application. See all 14.

$94.00Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

Select your vehicle to confirm fitment
Verify this part fits before purchasing β€” free returns if it doesn't
Step 2 — Quantity
Suspension Strut Cartridges are typically replaced in pairs, axle by axle.
Order total $94.00
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Suspension Strut Cartridge options

Bilstein B4 OE Replacement Front Strut Cartridge

The Bilstein B4 OE Replacement suspension strut cartridge is engineered to restore original ride quality and handling on select Audi applications. Built for drivers who want an OE-style replacement with Bilstein quality, this front cartridge is a direct solution for worn suspension damping on classic Audi models.

Compatible with 1987-1998 Audi 100, 200, 5000 Quattro, A6, A6 Quattro, S6, and V8 Quattro front suspension applications, part number 21-030390 is designed around factory-style performance and fitment.

Key Features

  • Bilstein B4 OE Replacement series for factory-style ride restoration
  • Suspension strut cartridge for front applications
  • Twintube internal design for controlled damping response
  • Black painted finish
  • Upper mount type: stem
  • Lower mount type: housing
  • Boot not included

Product Details

Bilstein B4 OE Replacement dampers are built to meet or exceed OE standards while preserving the original driving character of the vehicle. This suspension strut cartridge is a practical choice for Audi 100 and 200 front suspension service, as well as Audi A6, A6 Quattro, S6, and V8 Quattro front applications where restoring ride control matters. The 21-030390 part number is also listed for 1998 Audi A6 Quattro front use with sport suspension to chassis/VIN 4B-W-100-000.

This part cross-references KYB 366002 for the same application.

Common Problems This Part Can Address

  • Excessive bouncing after bumps
  • Reduced front-end control during braking and cornering
  • Uneven or unstable ride quality from worn dampers
  • Noisy or harsh suspension response from aging strut cartridges
  • Loss of original steering feel on older Audi chassis

Installation Notes and Tips

  • Verify front fitment by year, model, and chassis notes before ordering.
  • Confirm the vehicle uses a strut cartridge-style front suspension assembly.
  • Inspect related suspension components such as mounts, bushings, and springs during service.
  • Professional installation and alignment are recommended after suspension replacement.
  • Use the listed OE and interchange references, including 21-030390, to confirm application match.

Quality Assurance

Bilstein manufactures the B4 OE Replacement line to support OE-level fit and performance expectations for factory-style suspension service. Part number 21-030390 is built for consistent damping response and dependable replacement use on the listed Audi front applications.

Related reading

This part fits 33 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
1998AudiA6 QuattroBaseFrontSport Suspension to Chassis/VIN 4B-W-100-000; B4 OE Replacement
1997AudiA6BaseFrontB4 OE Replacement
1997AudiA6 QuattroBaseFrontB4 OE Replacement
1996AudiA6BaseFrontB4 OE Replacement
1996AudiA6 QuattroBaseFrontB4 OE Replacement
1995AudiA6BaseFrontB4 OE Replacement
1995AudiA6 QuattroBaseFrontB4 OE Replacement
1995AudiS6BaseFrontB4 OE Replacement
1994Audi100SFrontB4 OE Replacement
1994Audi100 QuattroCSFrontB4 OE Replacement
1994AudiV8 QuattroBaseFrontB4 OE Replacement
1993Audi100SFrontB4 OE Replacement
1993Audi100 QuattroCSFrontB4 OE Replacement
1993AudiV8 QuattroBaseFrontB4 OE Replacement
1992Audi100SFrontB4 OE Replacement
1992Audi100 QuattroCSFrontB4 OE Replacement
1992AudiV8 QuattroBaseFrontB4 OE Replacement
1991Audi100BaseFrontB4 OE Replacement
1991Audi100 QuattroBaseFrontB4 OE Replacement
1991Audi200BaseFrontB4 OE Replacement
1991Audi200 QuattroBaseFrontB4 OE Replacement
1991AudiV8 QuattroBaseFrontB4 OE Replacement
1990Audi100BaseFrontB4 OE Replacement
1990Audi100 QuattroBaseFrontB4 OE Replacement
1990Audi200BaseFrontB4 OE Replacement
1990Audi200 QuattroBaseFrontB4 OE Replacement
1990AudiV8 QuattroBaseFrontB4 OE Replacement
1989Audi100EFrontB4 OE Replacement
1989Audi100 QuattroBaseFrontB4 OE Replacement
1989Audi200BaseFrontB4 OE Replacement
1989Audi200 QuattroBaseFrontB4 OE Replacement
1988Audi5000 QuattroSFrontB4 OE Replacement
1987Audi5000 QuattroSFrontB4 OE Replacement
Directly replaces or cross-references 14 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
KYB — 3660024A0 413 0314A0 413 031 D4A0 413 031 J115 476441 413 031 G441 413 031 N443 412 031 F443 413 031 E443 413 031 F443 413 031 GF4-PNE-3039-BCF4-PNE-3039-BGPNE-3039