Factory rubber upper rear shock mounts deflect under load, compromising rear shock damping performance and introducing rear end knocking as the rubber ages and degrades — a problem that becomes significantly more pronounced on modified suspensions with increased shock valving. These aluminum and steel rear shock mounts with 85A polyurethane bushings virtually eliminate that deflection, keeping the rear shock absorber correctly positioned so it can operate as intended. Polyurethane offers lower compression variability, higher stability, and greater resistance to shock and ageing compared to standard rubber, making these mounts a meaningful performance and durability upgrade for both street and modified applications. Designed for 10mm shock shaft diameters and compatible with a wide range of OE and aftermarket shock absorber systems.

Features:

• Virtually eliminates factory shock mount deflection under load – keeps the rear shock absorber correctly positioned for proper damping operation
• 85A polyurethane bushings offer lower compression variability, high stability, shock resistance, and superior ageing resistance compared to standard rubber
• Aluminum and steel construction prevents breakage above the rear shock absorbers and provides long-term structural integrity
• Eliminates rear end knocking caused by worn or degraded factory rubber shock mount bushings
• Hard-anodized surface finish for corrosion and abrasion resistance in underbody conditions
• 10mm inner sleeve diameter – compatible with OE shocks and a wide range of aftermarket coilover systems

Specifications:

• Condition: 100% Brand New
• Type: Rear Shock Mounts
• Material: Aluminum · Steel · Polyurethane
• Surface Finish: Anodized
• Bushing Hardness: 85A Shore
• Shock Shaft Diameter: 10mm
• NVH Impact: Medium – will amplify road imperfections
• Recommended Use: Street
• Item Weight: 0.51 kg
• OEM Replacement Part Numbers: 33521092362 · 33521137972 · 33521128734 · 33521128819 · 33526772864 · 33521125554 · 33521123351 · 33526779670 · 37121133412

Fitment:

• BMW 3 Series E30 323 · 325 (1986–1991)
• BMW 3 Series E30 M3 (1986–1991)
• BMW 3 Series E36 323i · 325i · 328i (1992–1999)
• BMW 3 Series E36 M3 (1995–1999)
• BMW 3 Series E46 320i · 323i · 325i · 328i · 330i (1999–2006)
• BMW 3 Series E46 M3 (2001–2006)
• BMW Z3 2.5 · 2.8 · 3.0i (1996–2002)
• BMW Z4 E85 · E86 2.5i · 3.0i (2003–2008)
• Not compatible with BMW E36 / E46 318ti or convertible models

Shock Absorber Compatibility (10mm):

• OE standard shocks
• Bilstein PSS9 / PSS10
• H&R Coilovers
• FK Coilovers
• Raceland Coilovers
• ST Coilovers
• KW V1 · V2 · V3
• Koni Sport / Dinan
• AST 4XXX / 5XXX Series

Contents:

• 1x Pair Aluminum Rear Shock Mounts with 85A Polyurethane Bushings

Benefits:

• Dramatically reduces rear shock mount deflection for improved damping consistency and rear axle stability
• Eliminates rear end knocking associated with aged or deteriorated factory rubber mounts
• Performance improvement is most noticeable on modified suspensions with uprated shock valving
• 85A polyurethane hardness balances performance improvement with acceptable NVH levels for street-driven vehicles

Installation Notes:

• Polyurethane bushings must be greased during installation – do not install dry
• The 10mm sizing refers to the inner diameter of the shock mount sleeve – measure the OD of the top threaded portion of your shock absorber before ordering to confirm correct size
• OE shock shaft diameter is 10mm – aftermarket shocks vary and must be measured individually
• For 12mm shock shaft applications (Tein, MCS, JRZ, Ohlins, TC Kline S/A or D/A) a 12mm variant is required – this listing is 10mm only
• Not compatible with BMW E36 / E46 318ti or convertible body styles
• If unsure about your shock shaft diameter, contact our team or check directly with your shock absorber manufacturer before ordering

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues