KYB SM5859 Suspension Shock Mounting Kit - Rear Upper

KYB SM5859 Rear Upper Strut Mount

KYB SM5859 is a suspension shock absorber mounting kit built for rear upper applications on select Toyota and Scion models. It replaces worn vibration insulators and mount components that can transmit road noise, harshness, and movement into the cabin.

For drivers searching for a rear upper strut mount for 2000-2005 Toyota Echo or rear upper mount components for 2004-2006 Scion xA and xB, this KYB Mount Components part is made to restore proper suspension feel and steering response.

Key Features

• OE-quality replacement strut mount for application-specific fitment
• Superior rubber helps reduce noise, vibration, and harshness
• Mount bearings support smoother steering and help maintain front-end alignment
• Matched-grade studs and nuts for a precise service replacement
• Engineered to cushion impacts from road bumps and reduce jarring transfer

Product Details

KYB Mount Components are developed to replace hardened or worn suspension insulators that no longer isolate vibration effectively. The SM5859 is part of KYB’s strut mount line, which focuses on restoring suspension performance with components matched to the specific vehicle application. On vehicles such as the Toyota Echo, Scion xA, and Scion xB, a worn rear upper mount can contribute to excess noise, reduced ride quality, and inconsistent suspension movement. KYB SM5859 addresses those issues with a mount assembly designed around OE-style fit and function.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Vehicle Fitment

• Fits 2004-2006 Scion xA, Rear Upper, Mount Components
• Fits 2004-2006 Scion xB, Rear Upper, Mount Components
• Fits 2000-2005 Toyota Echo, Rear Upper, Mount Components

Common Issues This Part Helps Address

• Rear suspension noise from worn mount insulators
• Excess vibration transferred into the vehicle body
• Harsh ride feel over bumps and uneven pavement
• Steering or alignment concerns related to worn mount bearings
• Reduced suspension isolation from aged rubber components

Installation Notes and Tips

Confirm rear upper position and vehicle application before installation. Inspect surrounding suspension components, fasteners, and bearing surfaces for wear before reassembly. Because strut mount service affects suspension geometry, a professional alignment check is recommended after installation.

Quality Assurance

KYB SM5859 is part of KYB’s Mount Components line, which is built around OE-quality replacement standards and application-specific engineering. KYB strut mounts are known for restoring proper isolation and steering support in service applications like the Toyota Echo and Scion xA/xB.