Whiteline Rear Lower Coil Spring Seat/Pad Isolator (+10mm Ride Height Spacer) for BMW E46 3 Series & Z4 E89 – Spring Insulator, Perch Pad, Coil Shim, Bushing – OE Replacement Suspension Upgrade

Precision ride-height spacer for BMW E46 and BMW Z4 E89

Restore stance, sharpen handling, and eliminate sag with this premium lower coil spring seat for the BMW E46 platform and the BMW Z4 E89. Ideal for suspension refreshes, corner-weight fine tuning, and achieving a consistent chassis rake without committing to coilovers or adjustable springs. This smart upgrade provides an approximate 10 mm increase at the spring location, helping you level the car, dial in the look, and keep suspension geometry in check for fast road or track-day use.

Why enthusiasts choose this spring seat

• Approximately 10 mm ride height gain at the spring position for a balanced stance
• Helps correct lean from uneven loading and tired factory insulators
• Direct-fit replacement isolator for a clean, OEM-style installation
• Cost-effective suspension upgrade for improved chassis consistency
• Great for stance tweaks, alignment optimisation, and suspension refresh projects

Compatibility

• BMW E46 3 Series chassis
• BMW Z4 E89 chassis
• Position: lower coil spring seat

We use these spring seats on customer cars and the feedback is consistently positive. Owners love the tidy stance correction and the predictable feel it brings back to the rear axle. If you are chasing a neat, even look or correcting height after replacing worn components, this is a simple and very effective solution.

Installation and support

Professional fitting recommended. For installation, alignment checks, and setup advice, book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Key details

• Ride height change: approximately 10 mm increase
• Direct replacement for the lower spring isolator pad
• Designed for performance driving and everyday reliability

Search-friendly terms customers use

BMW E46 suspension pad, E46 rear spring seat, E46 spring isolator, coil spring shim, ride height spacer, spring cushion, spring perch pad, suspension bushing upgrade, chassis bush, Z4 E89 rear spring insulator, rear coil seat, performance suspension refresh, BMW ride height adjuster, stance correction, handling upgrade, fast road suspension, track-day setup, OE replacement spring pad, BMW suspension isolator.