Quiet the front suspension and cushion the coil spring with the KYB coil spring insulator SM5708, a front upper spring seat insulator that drops in as a direct-fit replacement for the 2002-2006 Nissan Altima and the 2004-2008 Nissan Maxima. It sits between the coil spring and its seat, where old, hardened insulators let metal-to-metal contact transmit squeaks, rattles, and vibration into the chassis.
This KYB spring seat insulator is application-specific and made to restore the cushioning of the factory piece:
- Isolates noise and vibration: helps reduce the squeaks, rattles, and vibration noises that develop as the original insulator ages and hardens.
- Application-designed fit: built for the listed vehicles to help optimize suspension performance in service.
- OE-level quality: matches or exceeds the quality of the original equipment component it replaces.
- Front upper location: serves the front upper spring seat position on the applications above.
If a worn, cracked, or flattened insulator is the source of your front-suspension noise, this replaces it. Inspect both sides and replace as needed for balanced, quiet ride quality.
Interchange: 540348J001 · 54034ZK00A
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
What is the KYB coil spring insulator SM5708?
It is a front upper coil spring seat insulator that cushions the coil spring against its seat, helping reduce squeaks, rattles, and vibration transmitted into the suspension.
What vehicles does SM5708 fit?
It is a direct-fit replacement for the 2002-2006 Nissan Altima and the 2004-2008 Nissan Maxima. See the "Vehicles it fits" section to confirm your vehicle.
Where is this insulator located?
It serves the front upper spring seat position on the listed applications, sitting between the coil spring and its seat.
What are signs my spring insulator may need replacing?
Squeaks, rattles, or vibration noises from the front suspension can be signs the original insulator has hardened, cracked, or flattened with age.
Should I replace both sides?
Inspecting and replacing both sides together is recommended for balanced, quiet ride quality, though this listing is for the applicable insulator on the vehicles shown.
