Powerflex BMW Z4 E85/E86 2003-2009 Roadster & Coupe Rear Shock/Damper/Str

BMW Z4 E85 E86 Rear Damper Upper Mount Kit with Poly Bushings, 12 mm Stud — Part No. PFR5-5630-12

Give your BMW Z4 Roadster or Coupé (E85 and E86, 2003 to 2009) the rear-end control it deserves with this Powerflex uprated rear damper top mount assembly and polyurethane bushing set for 12 mm shock pins. Built for drivers who want tighter handling, better grip and confidence on fast road and track day use, this upgrade reduces unwanted movement at the rear shock tower, keeping the tyre working harder and the chassis feeling planted.

We fit these on our own builds at MJ Modifications and on customer Z4s. The feedback is consistently excellent: crisper turn-in, improved stability over bumps and more consistent traction without the vague, sloppy feel of tired rubber mounts. Powerflex back it with a Lifetime Warranty for long-term peace of mind.

Why upgrade your rear strut top mount

• Sharper response and improved chassis control when cornering and braking
• More consistent tyre contact for enhanced grip and stability
• Polyurethane bushings resist deformation and ageing far better than OE rubber
• Helps reduce rear-end wander and tramlining on uneven roads
• Durable, cost-effective performance upgrade with Powerflex Lifetime Warranty

What’s included

• Part number: PFR5-5630-12
• Rear damper upper mount bracket and polyurethane bush kit for 12 mm pin shocks
• Quantity of bushes: 2
• Diagram reference: 30

Vehicle compatibility

Designed for BMW Z4 E85 and E86 models from 2003 to 2009 when using aftermarket rear shock absorbers with a 12 mm pin.

Not suitable for: E36 and E46 Cabriolet models.

Shock pin diameter guide by brand

Typical rear shock absorber shaft diameters for reference:

• Original BMW — 10 mm
• AST — 10 mm
• Bilstein HD, Sport, PSS coilovers — 10 mm
• FK coilovers — 10 mm
• H&R coilovers — 10 mm
• JRZ RS — 12 mm
• Koni Sport — 10 mm
• KW V1, V2, V3 — 10 mm
• ST coilovers — 10 mm
• Tein coilovers — 12 mm

This list is a guide only. If your dampers are not listed, measure the rear shock shaft where it mounts at the top. Choose PFR5-5630-10 for 10 mm pins or PFR5-5630-12 for 12 mm pins.

How polyurethane helps

Upgrading to quality poly bushes in the rear damper mount limits flex that can let the top of the shock move under load. The result is more accurate suspension geometry, better feedback and a more composed rear end without a harsh ride when correctly specified.

Cross references

OEM references for comparison: 33521092362, 33526779670

Professional fitting and setup

Want it installed correctly first time? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote or advice on choosing the correct pin size for your shocks.

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