Bilstein 11-303237 B1 Rear Shock Absorber Dust Boot & Bump Stop Kit for BMW E12 E28 E24 E23 (5/6/7 Series) - Damper/Strut Gaiter Bellows Dust Cover Protective Sleeve OEM Rear Suspension Service Pack

Bilstein 11-303237 B1 Rear Damper Protection Kit for BMW E12 E23 E24 E28

Keep your classic BMW’s rear suspension performing at its best with the Bilstein 11-303237 B1 service kit. This OE-spec rear damper protection set pairs a robust gaiter with a quality bump stop buffer to guard the piston rod from grit, spray and salt, helping preserve seal integrity and maintain smooth damping on UK roads. Ideal for restoration, MOT prep or a suspension refresh on BMW 5 Series E12 and E28, 6 Series E24 and 7 Series E23.

If you are looking for a rear shock absorber gaiter, rear strut bellows, rear damper guard, bump stop buffer, protective sleeve or rear suspension service kit for classic BMW models, Bilstein part number 11-303237 is the precise, OE-matched solution engineered to partner perfectly with Bilstein dampers.

Why it’s a must-have

• OE-quality materials for long service life on British roads
• Shields the rear damper rod from dirt and moisture to reduce wear
• Restores correct protection when fitting new dampers or refreshing ageing components
• Direct-fit Bilstein B1 service part for hassle-free installation
• Proven on customer cars with excellent feedback on fit and function

Fitting position

Rear axle

Applications

Tailored for the following BMW models where specified:

• BMW 5 Series
  • E12 (03.72 - 08.81): 518, 518i, 520, 520i, 520/6, 525, 528, 528i, 530i
  • E28 (05.81 - 12.87): 518, 518i, 520i, 525i, 525e, 528i, 524d, 524td
• BMW 6 Series
  • E24 (10.75 - 04.89): 628 CSi, 630 CS, 630 CSi, 633 CSi, 635 CSi
• BMW 7 Series
  • E23 (05.77 - 04.88): 728, 730

What you gain

The Bilstein B1 11-303237 kit replaces perished bellows and tired buffers, helping to prevent grit ingress, protect seals and keep damping consistent. A smart upgrade when installing new rear dampers or tidying a classic BMW’s underpinnings for reliable daily use and spirited road driving.

Our experience

We have installed this B1 service kit across E12, E23, E24 and E28 builds. Fitment is spot on and customers consistently report OE-level quality, quiet operation and confidence in all weather conditions.

Professional fitting

Prefer us to fit it for you? MJ Modifications offers professional installation in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Compatibility check

We can verify compatibility before dispatch. Add your UK registration or last 7 of VIN at checkout and our team will confirm that Bilstein 11-303237 suits your vehicle.

Part numbers and identifiers

• Part number: Bilstein 11-303237
• SKU: BILSTEIN-11-303237
• EAN: 4025258879341
• UPC: 651860887050

Brand

Bilstein B1 service components - precisely matched accessories for Bilstein shock absorbers.

Search-friendly terms

BMW E12 rear damper boot, BMW E28 rear shock absorber gaiter, BMW E24 strut bellows, BMW E23 7 Series bump stop, rear suspension protection kit, rear strut guard, piston rod sleeve, classic BMW 5 Series 6 Series 7 Series parts, Bilstein B1 service kit, rear damper shield.