# Bilstein 21-031199 B4 Series Twintube Strut Insert for 1991-1995 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 (use with 2.5inch dust cap and 22mm nut).

### Key Features

-   B4 Series OE Replacement Suspension Strut Cartridge

### Vehicle Fitment

-   1991 Bmw 525I (Note: Base)
-   1992 Bmw 525I (Note: Base)
-   1993 Bmw 525I (Note: Base; Station Wagon)
-   1994 Bmw 525I (Note: Base; Station Wagon)
-   1995 Bmw 525I (Note: Base; Station Wagon)
-   1994 Bmw 530I (Note: Base)
-   1995 Bmw 530I (Note: Base)
-   1991 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 21-031199.

**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
-   21-031199 fitment
-   Bilstein B4 Series Twintube Strut Insert
-   1991 Bmw 525I B4 Series Twintube Strut Insert

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

1991

Bmw

525I

Base

1992

Bmw

525I

Base

1993

Bmw

525I

Base; Station Wagon

1994

Bmw

525I

Base; Station Wagon

1995

Bmw

525I

Base; Station Wagon

1994

Bmw

530I

Base

1995

Bmw

530I

Base

1991

Bmw

535I

Base

1992

Bmw

535I

Base

1993

Bmw

535I

Base

1994

Bmw

540I

Base

1995

Bmw

540I

Base

## Details

- **Price:** 148.12 CAD
- **Vendor:** Bilstein
- **Type:** B4 Series Twintube Strut Insert
- **Tags:** 1991 Bmw 525I, 1991 Bmw 535I, 1992 Bmw 525I, 1992 Bmw 535I, 1993 Bmw 525I, 1993 Bmw 535I, 1994 Bmw 525I, 1994 Bmw 530I, 1994 Bmw 540I, 1995 Bmw 525I, 1995 Bmw 530I, 1995 Bmw 540I, 21-031199, Automotive Parts, B4 Series Twintube Strut Insert, Bilstein, Bilstein Suspension, Direct Replacement, Performance Suspension

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 148.12 CAD | In stock |

## Images

- Bilstein 21-031199 B4 Series Twintube Strut Insert for 1991-1995 Bmw 525I and More

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/bilstein-bmw-525i-suspension-strut-21-031199)
> Updated: 2026-07-16