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Front Upper Coil Spring Insulator | Westar ST-4942 Fits Chevrolet Pontiac Buick
Part # ST-4942
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Front Upper Coil Spring Insulator | Westar ST-4942 Fits Chevrolet Pontiac Buick
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Specifications
Brand: Westar
Part Number: ST-4942
Part Type: Coil Spring Insulator
Condition: New
Length: 5.5 in
Height: 2.75 in
Oe Equivalent: Yes
Position: Front Upper
Warranty: 24 Months
Weight: 0.32 lbs
Width: 5.5 in
Frequently Asked Questions
We're always here to help. If you can't find your answer, ask Rydon - our AI assistant will help you out.
What vehicle position is the Westar ST-4942 designed for?
The Westar ST-4942 is designed for the front upper position. It's specifically engineered to sit at the top of the front coil spring where it contacts the vehicle frame or strut tower, cushioning the spring and reducing noise and vibration transfer into the cabin.
Does this insulator fit both left and right sides, or do I need to order separately?
This insulator is for the left side only, as indicated in the fitment notes. You will need to order a separate insulator for the right side if you're replacing both front upper insulators, which is commonly recommended to maintain balanced suspension performance.
What are the signs that my front upper coil spring insulator needs replacement?
Common symptoms include clunking or rattling noises from the front suspension over bumps, increased road noise in the cabin, a rougher or harsher ride quality, and sometimes a creaking sound when steering or going over speed bumps. These occur because the worn insulator allows metal-to-metal contact between the spring and the frame.
Is this Westar insulator OE equivalent quality?
Yes, the Westar ST-4942 is OE equivalent and comes with a 24-month warranty. Westar is a premium-tier brand specializing in motor mounts and suspension components, trusted by professionals for delivering factory-like performance and durability.
Do I need special tools to install this coil spring insulator?
In most cases, yes—you'll need a coil spring compressor to safely compress the spring and access the upper insulator position. The vehicle must be raised on jack stands, and the lower control arm typically needs to be disconnected to allow the spring to drop for insulator replacement; this job is best left to experienced DIYers or professionals due to the serious injury risk from compressed springs.
Product Specifications
Brand
Westar
Part Type
Coil Spring Insulator
Condition
New
Oe Equivalent
Yes
Part Number
ST-4942
Length
5.5 in
Height
2.75 in
Position
Front Upper
Length5.5 in
ConditionNew
Height2.75 in
Oe EquivalentYes
PositionFront Upper
Warranty24 Months
Weight0.32 lbs
Width5.5 in
Tap to zoomPart # ST-4942Front Upper Coil Spring Insulator | Westar ST-4942 Fits Chevrolet Pontiac Buick
Brand WestarCondition NewCoil Spring InsulatorPosition Front Upper24-mo warranty
$295
$3.95SAVE 25%
Dealer charges $5.73SAVE 49%— You save $2.78
In Stock·10 or more available
QTY
1
Fast
Shipping
Shipping
30-Day
Returns
Returns
24-Mo
Warranty
Warranty
Expert
Support
Support
OE REPLACEMENT
Front Upper Coil Spring Insulator | Westar ST-4942 Fits Chevrolet Pontiac Buick
|
Part #:ST-4942
|
Coil Spring Insulator
$2.95In Stock
$3.95Save 25%
Quantity:
1
In Stock·10 or more available
Shipping calculated at checkout · Est. arrival Fri, Aug 14 to Fri, Aug 14
Ships To:Key Features
OEM-Equivalent QualityMeets/exceeds factory specs
American BusinessMaryland since 1986
24-Month WarrantyLimited coverage on every part
Free Same Day ShippingWe ship all orders the same business day before cutoff
Product HighlightsBeta
Reading the catalog · checking interchanges · researching…
What vehicle position is the Westar ST-4942 designed for?
The Westar ST-4942 is designed for the front upper position. It's specifically engineered to sit at the top of the front coil spring where it contacts the vehicle frame or strut tower, cushioning the spring and reducing noise and vibration transfer into the cabin.
Does this insulator fit both left and right sides, or do I need to order separately?
This insulator is for the left side only, as indicated in the fitment notes. You will need to order a separate insulator for the right side if you're replacing both front upper insulators, which is commonly recommended to maintain balanced suspension performance.
What are the signs that my front upper coil spring insulator needs replacement?
Common symptoms include clunking or rattling noises from the front suspension over bumps, increased road noise in the cabin, a rougher or harsher ride quality, and sometimes a creaking sound when steering or going over speed bumps. These occur because the worn insulator allows metal-to-metal contact between the spring and the frame.
Is this Westar insulator OE equivalent quality?
Yes, the Westar ST-4942 is OE equivalent and comes with a 24-month warranty. Westar is a premium-tier brand specializing in motor mounts and suspension components, trusted by professionals for delivering factory-like performance and durability.
Do I need special tools to install this coil spring insulator?
In most cases, yes—you'll need a coil spring compressor to safely compress the spring and access the upper insulator position. The vehicle must be raised on jack stands, and the lower control arm typically needs to be disconnected to allow the spring to drop for insulator replacement; this job is best left to experienced DIYers or professionals due to the serious injury risk from compressed springs.
Should I replace coil spring insulators in pairs?
While not always mandatory like replacing coil springs themselves, it's good practice to replace both front upper insulators together if one has failed. Doing both sides ensures balanced ride quality, prevents uneven suspension wear, and avoids a second labor charge when the other side inevitably fails shortly after.
What Chevrolet, Buick, and Pontiac models does the ST-4942 fit?
The Westar ST-4942 fits 138 applications across Chevrolet, Pontiac, Buick, Oldsmobile, and Saturn vehicles equipped with V6 (3.1L, 3.4L, 3.5L, 3.6L, 3.8L, 3.9L) and V8 (5.3L) engines. Some applications exclude vehicles with 17" or 18" wheels, so verify your specific year, make, model, and wheel size before ordering.
How long do coil spring insulators typically last?
Coil spring insulators can last many years under normal conditions, but they degrade over time due to heat, moisture, road salt, and constant vibration. Higher-mileage vehicles or those in harsh climates (heavy salt use, extreme temperature swings) may see insulator failure sooner; once symptoms like clunking or increased road noise appear, replacement restores quiet, comfortable ride quality and prevents accelerated wear on shocks and struts.
Front Upper Coil Spring Insulator | Westar ST-4942 Fits Chevrolet Pontiac Buick
Part # ST-4942
Main Image
Click to expand
1 / 2
$295
$3.95SAVE 25%
Dealer charges $5.73SAVE 49%— You save $2.78
In Stock·10 or more available
QTY
1
Fast
Shipping
Shipping
30-Day
Returns
Returns
24-Mo
Warranty
Warranty
Expert
Support
Support
OE REPLACEMENT
Front Upper Coil Spring Insulator | Westar ST-4942 Fits Chevrolet Pontiac Buick
|
Part #:ST-4942
|
Coil Spring Insulator
$2.95In Stock
$3.95Save 25%
Quantity:
1
In Stock·10 or more available
Shipping calculated at checkout · Est. arrival Fri, Aug 14 to Fri, Aug 14Ships To:Key Features
OEM-Equivalent QualityMeets/exceeds factory specs
American BusinessMaryland since 1986
24-Month WarrantyLimited coverage on every part
Free Same Day ShippingWe ship all orders the same business day before cutoff
What vehicle position is the Westar ST-4942 designed for?
The Westar ST-4942 is designed for the front upper position. It's specifically engineered to sit at the top of the front coil spring where it contacts the vehicle frame or strut tower, cushioning the spring and reducing noise and vibration transfer into the cabin.
Does this insulator fit both left and right sides, or do I need to order separately?
This insulator is for the left side only, as indicated in the fitment notes. You will need to order a separate insulator for the right side if you're replacing both front upper insulators, which is commonly recommended to maintain balanced suspension performance.
What are the signs that my front upper coil spring insulator needs replacement?
Common symptoms include clunking or rattling noises from the front suspension over bumps, increased road noise in the cabin, a rougher or harsher ride quality, and sometimes a creaking sound when steering or going over speed bumps. These occur because the worn insulator allows metal-to-metal contact between the spring and the frame.
Is this Westar insulator OE equivalent quality?
Yes, the Westar ST-4942 is OE equivalent and comes with a 24-month warranty. Westar is a premium-tier brand specializing in motor mounts and suspension components, trusted by professionals for delivering factory-like performance and durability.
Do I need special tools to install this coil spring insulator?
In most cases, yes—you'll need a coil spring compressor to safely compress the spring and access the upper insulator position. The vehicle must be raised on jack stands, and the lower control arm typically needs to be disconnected to allow the spring to drop for insulator replacement; this job is best left to experienced DIYers or professionals due to the serious injury risk from compressed springs.
Should I replace coil spring insulators in pairs?
While not always mandatory like replacing coil springs themselves, it's good practice to replace both front upper insulators together if one has failed. Doing both sides ensures balanced ride quality, prevents uneven suspension wear, and avoids a second labor charge when the other side inevitably fails shortly after.
What Chevrolet, Buick, and Pontiac models does the ST-4942 fit?
The Westar ST-4942 fits 138 applications across Chevrolet, Pontiac, Buick, Oldsmobile, and Saturn vehicles equipped with V6 (3.1L, 3.4L, 3.5L, 3.6L, 3.8L, 3.9L) and V8 (5.3L) engines. Some applications exclude vehicles with 17" or 18" wheels, so verify your specific year, make, model, and wheel size before ordering.
How long do coil spring insulators typically last?
Coil spring insulators can last many years under normal conditions, but they degrade over time due to heat, moisture, road salt, and constant vibration. Higher-mileage vehicles or those in harsh climates (heavy salt use, extreme temperature swings) may see insulator failure sooner; once symptoms like clunking or increased road noise appear, replacement restores quiet, comfortable ride quality and prevents accelerated wear on shocks and struts.
About This Coil Spring Insulator
This Westar automotive component is engineered to meet or exceed OEM specifications for reliable performance and long service life.
Key Features
- Meets or exceeds OEM specifications
- Direct-fit replacement design
- Rigorously tested for durability
- Professional-grade construction
- Backed by manufacturer warranty
Signs This Part Needs Replacement
- •Unusual noises from the component area
- •Decreased vehicle performance
- •Warning lights on dashboard
- •Visible wear or damage
- •Failed vehicle inspection
Westar
Trusted Automotive Brand
Westar is a trusted manufacturer of quality automotive parts.
View all Westar productsInstallation Guide
Moderate
1-3 hours
Tools Needed
Basic hand toolsTorque wrenchVehicle service manual
Frequently Asked Questions
WARNING: Handling passenger or off-highway motor vehicle parts can expose you to chemicals such as phthalates and lead, which are known to the State of California to cause cancer and reproductive harm. To minimize exposure, service the vehicle in a well-ventilated area, wear gloves, and wash your hands. For more information see www.P65Warnings.ca.gov/motor-vehicle-parts