Rear Shock Mount - 12 Mm - E30, E36, E46, Z3, Z4

Product Details

In high-performance track and race applications, deflection is the enemy of lap times. The factory BMW rear upper shock mounts are a notorious weak point, utilizing soft rubber compliant compounds that degrade rapidly under load, deflecting dynamically and causing inconsistent dampening behavior, rear-end clunking, and eventual structural fatigue.

The Powerflex Heritage Series Mount Kit is engineered to eliminate this compliance entirely while maintaining an understated, period-correct aesthetic. This comprehensive kit replaces the flimsy OEM assembly with an architecturally reinforced, high-grade aluminum bracket and a specialized 12mm bore polyurethane bushing.

Specifically sized for premium, race-tier aftermarket damper and coilover setups featuring a 12mm shock shaft pin (such as MCS, JRZ, and öhlins), this upgrade locks down the rear damper's upper mounting point. The result is instant fluid displacement inside the shock body, maximum tire-to-surface contact patch optimization, and razor-sharp, predictable chassis feedback.

Key Technical Features:

• Engineered for 12mm Race Dampers: Explicitly machined to fit high-end motorsport dampers with a 12mm upper pin diameter, providing a precise, zero-tolerance fit.

• Heritage Series Polyurethane Compound: Formulated to deliver the extreme structural integrity and deflection resistance of a track-spec bushing, but tinted in an understated dark grey to preserve a classic, clean look underneath the chassis or inside the boot.

• Captive Anti-Pop-Through Design: The high-strength aluminum brackets are CAD-designed to mechanically support the polyurethane bushing from the underside. This prevents the shock absorber shaft from violently punching through the mount under harsh curb-striking or high-velocity compression loads.

• Integrated Shock Tower Strengthening Plates: Includes heavy-duty, zinc-plated mild steel reinforcement plates that sandwich the thin sheet metal of the factory BMW rear shock towers. This distributes loads evenly and prevents the common motorsport failure of sheet metal tearing.

• Premium Hardware Componentry: Supplied with 4x Polyurethane bushes, 2x corrosion-resistant stainless steel inner sleeves, 2x CNC-machined aluminum brackets with integrated mounting studs, and specialized PTFE/Silicone assembly grease.

Prop 65 Warning

Product Q&A

Lifetime Replacement

Fits These Cars