Quiet a harsh, noisy ride with the KYB coil spring insulator SM5560, a front upper spring seat insulator that cushions the coil spring against its mounting seat to dampen vibration and road noise. It installs as a direct-fit replacement for the 2003-2007 Infiniti G35 and 2003-2009 Nissan 350Z (see the Buyer's Guide tab for engine-level fitment).
Over time the original insulator hardens and loses its cushioning ability, letting the spring transmit vibration into the chassis. KYB's replacement restores that isolating layer at the front upper spring seat.
If a worn or hardened front upper spring insulator is the source of your suspension noise, this KYB unit replaces it.
What is the KYB coil spring insulator SM5560?
It is a front upper spring seat insulator that cushions the coil spring against its mounting seat to help dampen vibration and road noise.
Which vehicles does it fit?
It is a direct-fit replacement for the 2003-2007 Infiniti G35 and 2003-2009 Nissan 350Z. Check the Buyer's Guide tab to confirm the fit for your vehicle.
Where does this insulator install?
At the front upper coil spring position, where it seats between the coil spring and its mounting seat.
What are signs the spring insulator may need replacing?
Squeaks, rattles or added vibration noise from the suspension can be signs the original insulator has hardened. Diagnose the cause before replacing.
Is this an OE-quality replacement?
Yes. KYB designs and builds this insulator to match or exceed the original equipment component for the listed applications.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
