What size spanner is needed for the cartridge nut? Front Bilstein B4 - Gas Shock Absorber - 21-030505

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What size spanner is needed for the cartridge nut? Front Bilstein B4 - Gas Shock Absorber - 21-030505

This is for the B4 replacement for the front of a BMW E30 with 51mm strut casings.

Status: Open Aug 28, 2026 - 02:40 AM

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Staff Answer

Sep 02, 2026 - 12:31 PM

Hello,

Thanks for your inquiry!

Preliminary check states that this model uses a 17mm top nut.

BILSTEIN - B4 OE Replacement

Fitting Position: Front Axle,

Shock Absorber Type: Gas Pressure,

Shock Absorber Design: Suspension Strut Insert,

Shock Absorber Mounting Type: Bottom Plate,

Shock Absorber Mounting Type: Top pin,

Strut Ø outer: 51 mm,

Shock Absorber System: Twin-Tube

You may contact us via chat or calls to get further assistance.

We hope this information will serve you well. Cheers!

Regards,

Bilstein-Shocks.co.uk

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What size spanner is needed for the cartridge nut?

Front Bilstein B4 - Gas Shock Absorber - 21-030505

Item replaces: 16-101920CAR FITMENT:BMW 3 (E30) 316, 316 (Ecotronic), 316 i, 316 i 1.8,318 i, 320 i, 323 i, 324 td, 325 e 2.7,325 i (09/82-11/89) with standard chassisVA: outside diameter strut 51 mmBMW 3 (E30) 318 is, 320 is (05/88-08/91) with standard chassisVA: outside diameter strut 51 mmBMW 3 C... See More

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What size spanner is needed for the cartridge nut? Front Bilstein B4 - Gas Shock Absorber - 21-030505

1answer

Staff Answer

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