Bilstein B1 Front Strut Top Mount & Bearing 12-248940 - BMW E-Series Upper Shock Mount/Top Hat for 1/3/5/6 Series E81 E82 E87 E88 E46 E90 E91 E92 E93 E39 E60 E61 E63 E64 X1 E84 X3 E83 - OE Replacement Front Suspension Mount (incl. ALPINA B3)

Bilstein B1 Upper Shock Mount - Part No. 12-248940 - BMW E-Series Fitment inc. ALPINA B3

Refresh tired front-end hardware with the Bilstein B1 upper mount assembly, part number 12-248940. This OE-equivalent front suspension mounting plate and bearing unit restores crisp steering feel, smooth rotation of the MacPherson strut, and quiet operation on daily drivers and fast-road builds. Designed by Bilstein to partner perfectly with their dampers and to replace worn factory components, this top support bearing is a proven fix for front-end knocks, creaks, vague steering and wandering.

We run these at MJ Modifications and fit them for customers across Warwickshire with excellent results. Feedback is consistently positive for ride quality, alignment stability and durability. If you are experiencing clunks over bumps, heavy steering return or uneven tyre wear, this is the quality solution that lasts.

Key reasons to choose this Bilstein B1 mount

• Direct-fit front axle upper mount for a wide range of BMW E-chassis and ALPINA B3 applications
• Factory-level engineering from Bilstein for precise geometry and long service life
• Optimised for Bilstein B4, B6 and B8 struts and fully compatible with original BMW dampers
• Helps maintain correct camber and caster, reduces NVH and improves steering precision
• Ideal for suspension refresh, preventative maintenance and fast-road upgrades

When to replace

• Any time new front shocks or springs are installed
• If there are clunks, groans, notchy steering or poor self-centring
• When alignment does not hold or tyres show feathering on the edges

Fitting position

Front axle - left or right

Vehicle compatibility

Fits the following BMW and ALPINA models:

ALPINA

• B3
  • B3 Saloon E90 09.07 - 02.13 Bi-Turbo and S Bi-Turbo
  • B3 Coupe E92 09.07 - 02.14 Bi-Turbo and S Bi-Turbo
  • B3 Touring E91 09.07 - 05.13 Bi-Turbo and S Bi-Turbo
  • B3 Convertible E93 09.07 - 05.13 Bi-Turbo and S Bi-Turbo

BMW 1 Series

• E81 09.06 - 12.11 116i 118i 120i 130i 116d 118d 120d 123d
• E87 02.03 - 01.13 116i 118i 120i 130i 116d 118d 120d 123d
• E82 Coupe 10.06 - 10.13 120i 125i 128i 135i 118d 120d 123d
• E88 Convertible 12.07 - 12.13 118i 120i 125i 128i 135i 118d 120d 123d

BMW 3 Series

• E92 Coupe 01.05 - 12.13 316i 318i 320i 323i 325i 328i 330i 335i 320d 325d 330d 335d
• E93 Convertible 05.06 - 12.13 318i 320i 323i 325i 328i 330i 335i 320d 325d 330d
• E46 Saloon 12.97 - 05.05 316i 318i 320i 323i 325i 325xi 328i 330i 330xi 318d 320d 330d 330xd
• E46 Compact 03.01 - 02.05 316ti 318ti 325ti 318td 320td
• E46 Coupe 12.98 - 07.06 316Ci 318Ci 320Ci 323Ci 323i 325i 325Ci 328Ci 330Ci 330xi M3 320Cd 330Cd
• E46 Convertible 04.00 - 12.07 318Ci 320Ci 323Ci 325Ci 330Ci 320Cd 330Cd
• E46 Touring 06.99 - 05.05 316i 318i 320i 323i 325i 325xi 328i 330i 330xi 318d 320d 330d 330xd
• E90 Saloon 02.04 - 02.12 316i 318i 320i 320si 323i 325i 328i 330i 335i 316d 318d 320d 325d 330d 335d
• E91 Touring 12.04 - 12.12 316i 318i 320i 323i 325i 328i 330i 335i 316d 318d 320d 325d 330d 335d

BMW 5 Series

• E39 Saloon 09.95 - 07.03 520i 523i 525i 528i 530i 520d 525td 525d 525tds 530d
• E39 Touring 09.96 - 06.04 520i 525i 530i 520d 525d 530d
• E60 Saloon 12.01 - 03.10 520i 523i 525i 525xi 525i xDrive 528i 528i xDrive 530i 530i xDrive 535i 540i 545i 520d 525d 525d xDrive 530d 530d xDrive 535d
• E61 Touring 03.04 - 12.10 520i 523i 525i 530i 545i 550i 520d 525d 530d 535d

BMW 6 Series

• E63 Coupe 09.03 - 12.10 630i 645Ci 650i 635d
• E64 Convertible 03.04 - 12.10 630i 645Ci 650i 635d

BMW X Models

• X1 E84 03.09 - 06.15 sDrive16i sDrive18i sDrive20i xDrive20i xDrive25i xDrive28i sDrive16d sDrive18d xDrive18d sDrive20d xDrive20d xDrive23d xDrive25d
• X3 E83 01.03 - 12.11 2.0i xDrive20i 2.5i 2.5si xDrive 2.5si xDrive25i 3.0i 3.0i xDrive xDrive30i 3.0si xDrive18d 2.0d 2.0sd xDrive20d 3.0d xDrive30d 3.0sd xDrive35d

What you gain

• Sharper steering input and improved on-centre feel
• Reduced noise and vibration from the front suspension turret
• Reliable top spring seat and bearing rotation for consistent handling
• Confidence on B-roads and motorways with stable alignment

Part numbers

• Bilstein: 12-248940
• EAN: 4025258759551
• UPC: 651860762050

Common search terms

BMW upper shock mount, E90 strut top bearing, E92 top hat, E93 suspension mount, E46 shock tower mount, E39 front top mount, E60 bearing plate, E61 front suspension mount, E63 E64 top support, X1 E84 strut bearing, X3 E83 upper mount, ALPINA B3 front mount, MacPherson top mount BMW, BMW suspension refresh kit, steering knock fix BMW, front end clunk BMW, BMW top spring seat, Bilstein B1 support bearing.

Professional fitting

We strongly recommend installation and wheel alignment by specialists. For expert fitting, choose MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk.

Compatibility check

We will verify fitment before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout so we can confirm suitability for your exact vehicle.

About Bilstein B1 hardware

Bilstein B1 accessories are engineered to OE standards to complement Bilstein dampers. The range includes support bearings, dust boots and bump stops, helping you complete a thorough suspension overhaul with confidence and long-term reliability.