# Bilstein 21-030246 B4 Series Twintube Strut Insert for 1989-1990 Bmw 525I and More

### Performance Overview

Bilstein B4 Shocks and Struts are ideal as OEM replacements, and are made to guarantee factory quality performance. They feature a large-diameter body, and rely on track-proven and road ready suspension technologies. The shocks are available in a classic black finish, and are backed by a limited lifetime warranty. Standard Suspension to 06/90 (use with 2.5inch dust cap and 19mm nut).

### Key Features

-   B4 Series OE Replacement Suspension Strut Cartridge

### Vehicle Fitment

-   1989 Bmw 525I (Note: Base)
-   1990 Bmw 525I (Note: Base)
-   1989 Bmw 535I (Note: Base)
-   1990 Bmw 535I (Note: Base)

### FAQ

**Will this fit my vehicle?**  
Please verify your year, make, model, position, and any fitment notes using the compatibility list above before purchase.

**What part number is this?**  
The listed part number is 21-030246.

**Is this product designed for direct replacement?**  
Yes. This product is intended to match compatible vehicle applications listed in the fitment section.

**Should I confirm fitment before ordering?**  
Yes. Always compare your original part, position, and vehicle details with the fitment chart before ordering.

### Common Searches

-   B4 Series Twintube Strut Insert for Bmw 525I
-   21-030246 fitment
-   Bilstein B4 Series Twintube Strut Insert
-   1989 Bmw 525I B4 Series Twintube Strut Insert

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

1989

Bmw

525I

Base

1990

Bmw

525I

Base

1989

Bmw

535I

Base

1990

Bmw

535I

Base

## Details

- **Price:** 142.56 CAD
- **Vendor:** Bilstein
- **Type:** B4 Series Twintube Strut Insert
- **Tags:** 1989 Bmw 525I, 1989 Bmw 535I, 1990 Bmw 525I, 1990 Bmw 535I, 21-030246, Automotive Parts, B4 Series Twintube Strut Insert, Bilstein, Bilstein Suspension, Direct Replacement, Performance Suspension

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 142.56 CAD | In stock |

## Images

- Bilstein 21-030246 B4 Series Twintube Strut Insert for 1989-1990 Bmw 525I and More

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/bilstein-bmw-525i-suspension-strut-21-030246)
> Updated: 2026-07-06