Powerflex PFR5-5630-12 Polyurethane Rear Shock Absorber Top Mount Bushes 12mm Pin/Shaft - BMW E46 M3 3 Series - RSM/Damper Upper Mount Bushing Inserts Polybush Pair

Poly bush kit for rear damper upper mount - 12 mm pin - PFR5-5630-12 - BMW E46 M3

Transform the rear-end control of your BMW E46 M3 with this Powerflex polyurethane rear damper upper mount kit for 12 mm damper shafts. By replacing tired rubber at the top of the shock absorber, these uprated PU inserts cut unwanted movement, sharpen response and deliver a more planted, predictable drive on fast road and track days.

Part number: PFR5-5630-12

Vehicle application: BMW E46 M3 using a 12 mm rear damper rod at the upper mount. Not suitable for E36 or E46 Cabriolet.

Why this upgrade works

• Crisper rear axle response and improved cornering stability
• Reduces compliance compared with ageing OE rubber mounts
• Better tyre contact patch for traction, braking and feedback
• Ideal for performance road builds and track-focused setups
• Excellent NVH control for a taut yet compliant ride
• Long-lasting solution that outperforms standard bushes over time
• Backed by the Powerflex Lifetime Warranty

We run these on our own cars and customer builds, and the feedback is consistently positive. Expect a tighter rear end, more confidence over bumpy surfaces and clearer communication from the chassis.

Sizing and fitment guide

This 12 mm kit suits rear dampers that use a 12 mm shaft or pin at the top mount. If your damper uses a 10 mm shaft, choose PFR5-5630-10 instead.

Typical rear damper shaft diameters:

• 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

The above is a guide. If your damper brand is not listed, measure the outside diameter of the rear damper rod to confirm whether you need PFR5-5630-10 or PFR5-5630-12.

Important: Not for E36 or E46 Convertible models.

What you receive

• Quantity: 2 bushes (pair)
• Diagram reference: 30

Professional fitting

Want it installed correctly the first time? Book professional fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search-friendly terms

E46 M3 rear damper top mount bush, rear shock absorber upper mount insert, 12 mm RSM bush kit, BMW E46 M3 suspension upgrade, PU bushings for rear shocks, uprated rear top hat bush, E46 M3 rear shock mount bushing 12 mm, performance chassis bushes, track day suspension parts, fast road rear mount, coilover compatible 12 mm rear mount, BMW M3 E46 rear upper shock bush, Powerflex PFR5-5630-12.

OE cross references: 33521092362, 33526779670