KYB 551132 Gas-a-Just Rear Monotube Strut for 06-13 Lexus IS250 IS350 RWD/AWD

Vehicle Fitment

• 2006-2013 Lexus IS250 Sedan (RWD, 2.5L V6) - Base, all trims
• 2006-2013 Lexus IS250 AWD Sedan (AWD, 2.5L V6) - Base, all trims
• 2010-2013 Lexus IS250 C Convertible (AWD, 2.5L V6)
• 2006-2013 Lexus IS350 Sedan (RWD, 3.5L V6) - Base, all trims
• 2011-2013 Lexus IS350 Sedan (AWD, 3.5L V6) - Base, all trims
• 2010-2013 Lexus IS350 C Convertible (RWD, 3.5L V6)

Fitment Notes

• Position: Rear - driver side and passenger side (sold individually; 2 units required per axle)
• Fits both RWD and AWD variants - confirm drivetrain before ordering
• Replace struts in pairs to maintain balanced rear handling and stability
• Upper mount type: Threaded stem (12 x 1.25) - reuses factory mounting hardware
• Dust boot and additional components sold separately if needed
• Replaces OEM Lexus part numbers: 4853080285, 4853080506, 4853080574

Features

• KYB Gas-a-Just high-pressure monotube design - instant, fade-free damping response
• Two-chamber monotube design: air-free hydraulic piston area and floating-piston nitrogen gas area
• Velocity-sensitive valving automatically adjusts to road conditions and driving demands
• Eliminates aeration and foaming - consistent performance at all speeds and temperatures
• Micro-smooth, hard-chromed piston rod minimizes friction and extends seal life
• Seamless cylinder and eyering construction eliminates seam-related failure points
• OE monotube replacement and performance upgrade over factory twin-tube units
• Backed by KYB's limited lifetime warranty to the original purchaser

Specifications

• Part Number: 551132
• Product Line: KYB Gas-a-Just
• Strut Design: High-Pressure Monotube, Gas-Charged (Nitrogen)
• Extended Length: 21.92 in.
• Collapsed Length: 16.96 in.
• Stroke Length: 4.96 in.
• Upper Mount Type: Threaded Stem (12 x 1.25)
• Lower Mount Type: E2 (14.2 x 60)
• Adjustable Valving: No
• Ride Height: Stock (OE restoring)
• Position: Rear (driver or passenger side)
• Drivetrain: RWD and AWD
• Quantity: Sold individually (1x strut per package)

Included Components

• 1x KYB Gas-a-Just Rear Monotube Strut
• Note: Dust boot and bump stop sold separately; factory mounting hardware is reused

Product Description

The KYB 551132 is a high-pressure Gas-a-Just monotube rear strut engineered for the 2006-2013 Lexus IS250 and IS350, covering both RWD and AWD configurations across sedan and convertible body styles. Unlike the twin-tube Excel-G, the Gas-a-Just uses a single-tube monotube design with two separate working chambers - an air-free hydraulic piston area for immediate damping and a floating-piston nitrogen gas area that automatically adjusts to changing loads and road conditions. The result is a rear strut that provides firmer, more consistent damping than factory twin-tube units with no fade under sustained use.

This is the correct OE monotube replacement for the IS-platform Lexus, directly substituting Lexus OEM part numbers 4853080285, 4853080506, and 4853080574. The threaded stem upper mount uses existing factory hardware, and the strut is manufactured in Japan - the same origin as the vehicle itself. Sold individually - two units required for a complete rear axle replacement. Backed by KYB's limited lifetime warranty.