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Product Overview

The Rear Upper Control Arm Bushing RGX500121 (also referenced as LR051616) is an OE-grade suspension component engineered for the for Land Rover Discovery 3 / LR3, Discovery 4 / LR4, and Range Rover Sport (L319 / L320) models with air suspension. This rubber bushing presses into the rear upper suspension arm, providing a flexible pivot point that isolates road vibrations while maintaining proper rear suspension geometry and handling stability.RGX500121 has been superseded by LR051616, which is the current replacement part number.

Key Features

• Rear upper control arm position – fits the rearward bushing of the rear upper arm

• Fits left and right sides – one part number covers both rear upper arms

• OE-grade quality – available as Genuine Land Rover, Lemförder, Febi Bilstein, and Polybush alternatives

• Direct-fit replacement – press-in installation; matches factory control arm dimensions

• Quantity required – 2 per vehicle (one per side)

OE Cross-Reference

Note: LR051616 supersedes RGX500121. Both part numbers refer to the same rear upper control arm bushing.

Technical Specifications

Vehicle Fitment

Engine compatibility (verify with VIN):

• 4.0L V6 Petrol

• 4.4L V8 Petrol

• 2.7L TDV6 Diesel

• 3.0L TDV6 / SDV6 Diesel

• 5.0L V8 Petrol (NA & SC)

⚠️ Important: This bushing is for air suspension models only. Fitment varies by model year and production date – verify before ordering.

Signs of Failure

• Clunking or knocking noise – from rear suspension over bumps

• Uneven tyre wear – abnormal wear patterns on rear tyres

• Poor handling – reduced stability and rear-end precision

• Vibration or wobble – felt through the chassis

• Inability to align vehicle – alignment settings not holding

💡 Worn bushings degrade rubber, causing noise, vibration, and handling issues. If one side is worn, replace both sides simultaneously for balanced rear suspension performance.

Critical – Verify Your VIN Before Ordering

Suspension bushings are VIN- and suspension-specific. This part is for air suspension models only. Provide your VIN – our team confirms exact compatibility before dispatch. We cannot accept returns for misordered parts without VIN verification.

💡 Installation Tip: Professional installation recommended – a hydraulic press is required to remove and install the bushing in the control arm. Polybush polyurethane alternatives (LR051616PY) are available as a long-term upgrade, offering improved durability and handling without sacrificing ride comfort. Torque all fasteners to manufacturer specifications and perform a wheel alignment after installation.

Why Choose Us

Contact us for bulk orders or VIN‑checked quotes.

Specifications subject to change; images for reference only.Aftermarket replacement – not affiliated with Jaguar Land Rover.

Frequently Asked Questions

• Extensive Industry Experience: 13 years specializing in Auto Parts auto parts with precise product matching and technical solutions.
• Quality Assurance: 10-stage quality inspection process including durability testing, surface roughness analysis, and dimensional verification.
• Manufacturing Excellence: 15,000㎡ production base with 10,000+ SKUs in inventory for fast order fulfillment.
• Strategic Partnerships: Collaborations with 50+ factories including suppliers to international brands like Womala and Hella.