KYB SM5578 Coil Spring Insulator - Rear Upper

KYB Rear Upper Coil Spring Insulator SM5578

KYB SM5578 is a rear upper coil spring insulator built to replace worn vibration isolators that can create noise and harshness in the suspension. It is an OE-quality mount component for select Acura and Honda applications, including Accord, TSX, TL, CL, Crosstour, and Accord Crosstour models.

Key Features

• OE-quality replacement spring insulator for the rear upper suspension position
• Helps reduce squeaks, rattles, and vibration noise from aged insulators
• Built to match or exceed original equipment design and quality
• Part of KYB Mount Components, a product line focused on suspension mounting and isolation parts
• Fits select 1998-2015 Honda and Acura vehicles

Product Details

KYB Mount Components are engineered for suspension service where noise isolation and fit matter. The SM5578 spring insulator is designed for the rear upper position on applications such as 1998-2012 Honda Accord, 2004-2014 Acura TSX, and 1999-2003 Acura TL. It also fits 2012-2015 Honda Crosstour, 2010-2011 Honda Accord Crosstour, and 2001-2003 Acura CL. This part cross-references Monroe Shocks & Struts (e.g., 905994) for the same application.

Common Problems It Can Help Address

• Squeaking from hardened or deteriorated spring insulation
• Rattling or clunking noise from the rear suspension area
• Excess vibration transferred through the spring seat area
• Reduced ride comfort caused by worn isolation components
• Fitment issues when replacing a damaged rear upper spring insulator

Installation Notes

Install SM5578 in the rear upper spring insulator location only on the listed applications. Verify year, make, model, and rear upper position before ordering, especially on Honda Accord and Acura TSX fitments where multiple suspension configurations may exist. Inspect adjacent suspension components for wear during service so the new insulator seats correctly.

Quality Assurance

KYB designs Mount Components to provide OE-style replacement performance with attention to fit, noise control, and suspension isolation. The SM5578 is built to the same application-specific standards KYB uses across its suspension mounting line.