Unity 15021 Suspension Strut and Coil Spring Assembly - Rear Left

Rear Left Strut Assembly for Buick, Regal, and Grand Prix

Unity 15021 is a pre-assembled rear left suspension strut and coil spring assembly built for direct replacement on select Buick, Pontiac applications. It arrives fully assembled for plug-and-play installation, helping reduce the time and steps normally involved in rebuilding a rear suspension corner.

Compatible with 1997-2005 Buick Century rear left, 1997-2004 Buick Regal rear left, and 1997-2003 Pontiac Grand Prix rear left, this assembly is a fitment-specific solution for common rear suspension service needs. The Unity 15021 part number is also referenced by OE and aftermarket cross numbers for the same application.

Key Features

• Pre-assembled complete strut assembly with coil spring and top mount
• Ready-to-install design for rear left placement
• Built to OEM specifications for fit and function
• Compressed length: 15.53 in; extended length: 23.09 in
• Travel length: 7.56 in; body length: 15.42 in
• Economy-grade suspension replacement for service-focused repairs
• This part cross-references Monroe Shocks & Struts 181662L for the same application.

Product Details

Unity Automotive has more than 40 years of aftermarket suspension manufacturing experience, with a product line focused on OE-style replacement parts for everyday repair work. The Unity 15021 strut assembly is engineered for the rear left position and matches the listed vehicle applications for Buick Century, Buick Regal, and Pontiac Grand Prix. For buyers searching for a rear left strut assembly for a 1997-2005 Buick Century or a 1997-2003 Pontiac Grand Prix, this unit provides a direct-fit service part with the major components already assembled.

Common Repair Uses

• Replacing a worn rear strut assembly on a Buick Century, Regal, or Grand Prix
• Restoring rear suspension ride height and support
• Addressing noise from a fatigued top mount or spring seat area
• Correcting uneven rear handling caused by a worn strut unit
• Servicing a rear left suspension corner with a direct replacement assembly

Installation Notes

Install on the rear left position only. Verify year, make, model, and side before ordering, and compare the listed compressed, extended, and body dimensions to the removed part when needed. Because this is a fully assembled unit, it reduces the need to transfer major suspension components during installation. Always follow factory service procedures and torque specifications for the vehicle.

Quality Assurance

Unity Automotive builds suspension parts to OEM specifications and backs its products with a customer satisfaction guarantee. The brand’s suspension focus and long-standing aftermarket manufacturing experience support consistent fitment and dependable service for routine replacement work.