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isolates road vibrations while maintaining proper rear suspension geometry and handling stability.RGX500121 has been superseded by LR051616, which is the current replacement part number.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
| Current Replacement | Superseded | Additional References |
|---|---|---|
| LR051616 | RGX500121 | 3439101 (Lemförder), 176652 (Febi Bilstein) |
Note: LR051616 supersedes RGX500121. Both part numbers refer to the same rear upper control arm bushing.
Technical Specifications
| Parameter | Detail |
|---|---|
| Part Type | Rear Upper Control Arm Bushing |
| Position | Rear Upper – Rearward (Left & Right) |
| Inner Diameter | 16 mm |
| Outer Diameter | 54 mm |
| Height/Thickness | Approx. 76 mm |
| Weight | Approx. 0.94 kg (Polybush set) |
| Mounting Type | Press-fit |
| Condition | Brand New, OE-Grade |
Vehicle Fitment
| Make | Model | Chassis | Position | Years |
|---|---|---|---|---|
| for Land Rover | Discovery 3 / LR3 | L319 | Rear Upper | 2005 – 2009 |
| for Land Rover | Discovery 4 / LR4 | L319 | Rear Upper | 2010 – 2016 |
| for Land Rover | Range Rover Sport | L320 | Rear Upper | 2005 – 2013 |
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