Unity 15904 Suspension Strut and Coil Spring Assembly - Rear Right

Rear Right Strut Assembly for Highlander and RX

Unity 15904 is a pre-assembled rear right suspension strut and coil spring assembly built for direct replacement on select Toyota and Lexus applications. It is fully assembled and ready to install, making it a practical choice for restoring rear suspension function on the 2004-2007 Toyota Highlander, 2004-2006 Lexus RX330, and 2007-2009 Lexus RX350.

Unity Automotive has more than 40 years of aftermarket suspension manufacturing experience, with products built to OEM specifications for consistent fit and function. The Unity 15904 strut assembly is part of the brand’s complete strut line, which focuses on ready-to-install suspension replacements for common passenger vehicle applications.

Key Features

• Part number: 15904
• Rear right suspension strut and coil spring assembly
• Fully assembled and ready to install
• Pre-assembled complete strut assembly with top mount and related components
• Compressed length: 15.41 in.
• Extended length: 22.925 in.
• Travel length: 7.515 in.
• Body length: 14.31 in.
• Built to OEM specifications
• Economy-grade replacement for select rear suspension applications

Detailed Description

This Unity 15904 rear right strut assembly is engineered for direct replacement on the rear suspension of the Toyota Highlander and Lexus RX platform. It is a complete strut and coil spring assembly, which helps simplify service by combining the major suspension components into one ready-to-install unit. For shoppers searching for a rear right strut assembly for 2004-2007 Toyota Highlander, or a rear right suspension strut for 2004-2006 Lexus RX330 and 2007-2009 Lexus RX350, this part matches those applications directly.

The assembly is designed around the listed compressed, extended, and travel dimensions to support proper suspension geometry in the specified vehicles. Unity’s suspension products are manufactured with an OEM-specification focus, and the brand positions this line as a straightforward replacement solution for common ride-height and damping service needs. Part number 15904 is also a useful reference when cross-checking replacement options for the same rear right application.

This part cross-references Monroe Shocks & Struts (e.g., 182215) for the same application.

What It Helps Address

• Rear suspension noise from worn strut components
• Excessive bouncing or reduced damping at the rear of the vehicle
• Uneven ride height caused by fatigued coil spring components
• Handling instability from a worn rear right strut assembly
• Time-consuming suspension service when rebuilding components individually

Installation Notes and Tips

Compatible With 2004-2007 Toyota Highlander, rear right; 2004-2006 Lexus RX330, rear right; and 2007-2009 Lexus RX350, rear right. This assembly excludes front wheel drive and vehicles with air suspension, so verify the vehicle’s suspension configuration before ordering. Confirm the rear right position and compare the original unit’s dimensions and mounting points to the listed specifications before installation.

Because this is a fully assembled strut unit, installation is typically more direct than rebuilding a strut from separate components. Always inspect adjacent suspension parts, including mounts and bushings, during service to avoid repeat repairs.

Quality Assurance

Unity Automotive has over 40 years of aftermarket suspension manufacturing experience and builds its suspension systems to OEM specifications. The brand emphasizes consistent product quality and customer satisfaction across its suspension catalog, including this Unity 15904 rear right strut assembly.