Unity 15021 Rear Left Complete Strut Assembly

Unity 15021 Rear Left Strut Assembly

The Unity 15021 is a complete rear left strut assembly designed for specific GM W-body sedans. It arrives fully preassembled with top mount, bearing plate, bumper, insulators, and coil spring for a direct bolt-in repair. This unit suits DIY mechanics and shops wanting to avoid specialty spring compressors during suspension work. Unity Automotive backs the part with over 50 years of aftermarket manufacturing experience.

Check fitment against your vehicle before ordering

Confirm the car is a 1997-2005 Buick Century, 1997-2004 Buick Regal, or 1997-2003 Pontiac Grand Prix. Verify the repair is for the rear left corner only, as this assembly does not fit the right side. Ensure existing mounting hardware is reusable or sourced separately, because the kit includes the strut components but not necessarily every attaching bolt or nut. Measure ride height after installation to confirm correct spring rate for the application.

Sustained load behaviour on rough roads

The coil spring and damper work together continuously over potholes and corrugations, maintaining tyre contact without the fade seen in worn original units. Fresh insulators and bump stops absorb repeated harsh impacts that would bottom out tired components. Unity’s 50-year focus on suspension geometry means the assembly keeps alignment angles stable through thousands of kilometres of daily driving. Long-lasting reliability is the design target rather than short-term showroom feel.