KYB SR4158 Strut-Plus Complete Corner Unit Assembly - Strut, Mount and Spring

The KYB SR4158 Strut-Plus is a complete, ready-to-install rear strut corner assembly that includes the strut, coil spring, top mount, insulators, boot, and bumper stop — everything needed for a full strut replacement in a single pre-assembled unit. As an original equipment supplier to major vehicle manufacturers worldwide, KYB brings OE-level engineering directly to the aftermarket.

A strut assembly plays a critical role in your vehicle's performance: it supports vehicle weight, sets ride height, serves as the steering pivot, governs handling stability, and directly influences the effectiveness of electronic safety systems such as Electronic Stability Control (ESC) and ABS. Replacing worn components with a quality assembly like the SR4158 helps restore all of these functions to factory specifications.

Key Features:

• Complete pre-assembled unit — includes strut, high-carbon steel coil spring, top mount, insulators, boot, and bumper stop; no spring compressor required for installation
• KYB Excel-G twin-tube gas strut at the core, with a stronger steel outer shell and application-specific damping valves assembled by hand in-house
• Corner-specific engineering — designed for specific vehicle positions (driver/passenger, front/rear) to account for varying engine sizes, ride heights, and corner weights
• Corrosion-resistant coil spring — fatigue-tested and engineered to restore ride height within OE specifications
• Electronic safety system compatible — proper damping characteristics help ensure ESC, ABS, and other crash avoidance systems function as the vehicle manufacturer intended
• Industry-leading strut body rigidity — KYB uses some of the thickest strut bodies and brackets available to minimize flex and support proper wheel alignment
• Lifetime warranty on the strut damper; 1-year warranty on coil spring, mount, boot, and hardware components

The Strut-Plus eliminates the need to source individual components separately, making it an efficient solution for both professional technicians and experienced DIY mechanics. Because KYB manufactures original equipment for new vehicles, the SR4158 is built using the same materials and engineering processes used on the original production line.