Is this worth it over a dealer shock?

Yes for most IS owners. KYB is an OE supplier and the Gas-A-Just is a direct-fit monotube, usually at a lower price than a Lexus-branded part.

Should I replace both front shocks at once?

Yes. Replacing one corner leaves mismatched damping, which can cause uneven handling and faster wear on the new unit.

Does it fit my IS350?

It fits 2014–2018 IS350 Base models. Check your submodel and drivetrain before ordering, since other trims use different part numbers.

Is it stiffer than the original shock?

Slightly. A fresh Gas-A-Just feels firmer than a worn original, and some owners find it stiff on rough roads.

One front-left shock absorber. Mounts, boots and hardware are not included unless the listing says so.

The best new price was $92.35 at Amazon as of November 4, 2026. Shock prices move little, so watch for store-level discounts rather than seasonal sales.

Where can I buy the KYB 5510012 Shocks & Struts Gas-A-Just Front Left Shock?

12 stores we checked sell it, including Amazon, OSS Motorsport, Alpha Team Car Customs & Care, SMGspeed, BTRcarcustoms.

KYB 5510012 Shocks & Struts Gas-A-Just Front Left Shock: $92.35 at Amazon, 18% under other stores

Q: Where is the KYB 5510012 Shocks & Struts Gas-A-Just Front Left Shock cheapest?

At Amazon, for $92.35, 18% under what the other stores charge, as of our latest check.

What reviewers say

Owners of Lexus IS cars generally rate KYB Gas-A-Just as a solid stock replacement that restores a firm, controlled ride. Complaints center on stiffness over rough roads and on the need to replace both sides at once.

Pros

Restores firm, planted handling
Quiet operation with no clunks
Holds up well over tens of thousands of miles
Good value versus dealer parts

Cons

Noticeably stiffer than worn originals
Ride can feel harsh on broken pavement
Single-corner sale means buying two for a pair

From OSS Motorsport

Gas-a-just monotube strut as an OE monotube replacement to restore original capabilities
Two separate working chambers: air-free hydraulic piston and valve area for responsiveness and control
Second high-pressure nitrogen gas area with floating piston for comfortable normal driving and instant performance on demand
Helps keep Electronic Safety Systems performing as designed
Front left shock

Fit: Front Left; fits 2014-2015 Lexus IS250 Base, 2016-2018 Lexus IS300, 2014-2018 Lexus IS350
Guarantee: Price Match Guarantee - found a better price, send an email with the link
Returns: Absolutely NO refunds/exchanges on special order items; non special order returns must be requested within 14 days of purchase and customer pays shipping; unwan
Shipping: In stock at Winnipeg warehouse ships in 1 to 3 business days; in stock in Canada ships from a Canadian warehouse in 3 to 5 business days; in stock at US warehou

About the KYB 5510012 Shocks & Struts Gas-A-Just Front Left Shock

The Gas-a-just monotube strut is available as an OE monotube replacement to restore your vehicle's original capabilities. The KYB Gas-a-just has two separate working chambers: An air-free hydraulic piston and valve area for responsiveness and control, and a second high-pressure nitrogen gas area with a floating piston that provides a comfortable ride during normal driving and adds instant performance on demand.Electronic safety systems depend on the suspension, brakes and tires operating as the vehicle manufacturer intended. The KYB Gas-a-just helps keep Electronic Safety Systems performing as designed.This Part Fits:

Year

Make

Model

Submodel

2014-2015

Lexus

IS250

Base

2016-2018

Lexus

IS300

Base