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Unity 15-521001 Air Suspension Spring - Rear Left
| Brand | Unity 15-521001 |
|---|---|
| Position | Rear Left |
| Fits | Mercedes-Benz · 18 vehicles |
OEM-spec construction. Built to match original equipment standards for confident installation.
Air suspension spring. Restores the cushioning and support your suspension system needs.
Unity Automotive. Backed by over 40 years in aftermarket suspension manufacturing.
Rear Left Air Suspension Spring for Mercedes-Benz
Restore rear suspension support with this Unity air suspension spring, part number 15-521001. It is built for specific Mercedes-Benz applications and follows OEM-style specifications for a direct-fit replacement on the rear left side.
- Air suspension spring for rear left placement
- Fits 2015-2020 Mercedes-Benz C300, rear left, 4MATIC models only
- Fits 2017-2020 Mercedes-Benz C43 AMG, rear left, 4MATIC models only
- Fits 2015-2020 Mercedes-Benz C63 AMG, rear left
- Fits 2016 Mercedes-Benz C450 AMG, rear left, 4MATIC models only
- Fits 2015 Mercedes-Benz C400, rear left, 4MATIC models only
Product Details
Unity Automotive has more than 40 years of aftermarket manufacturing experience and focuses on suspension components built to OEM specifications. Part number 15-521001 is intended for Mercedes-Benz C-Class and AMG models with rear left air suspension applications, including Mercedes-Benz C300, C43 AMG, C63 AMG, C450 AMG, and C400 listings shown above. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.
Common Suspension Issues
- Rear corner sagging or uneven ride height
- Air suspension loss at the rear left position
- Ride quality changes caused by a worn spring assembly
- Suspension warning symptoms tied to rear support loss
Installation Notes
Confirm the vehicle is a rear left application before ordering. Verify model year, trim, and 4MATIC coverage where noted, since several listings are limited to 4MATIC models only. Compare the original spring layout and mounting points on the Mercedes-Benz C300, C43 AMG, C63 AMG, C450 AMG, or C400 before installation.
Quality Assurance
Unity builds suspension parts to OEM specifications and backs its aftermarket lineup with a customer satisfaction guarantee. The brand’s long-standing focus on suspension engineering supports consistent fitment and dependable replacement performance.
| Year | Make | Model | Drive Type | Position | Notes |
|---|---|---|---|---|---|
| 2020 | Mercedes-Benz | C300 | AWD | Rear Left | 4MATIC Models Only |
| 2020 | Mercedes-Benz | C43 AMG | AWD | Rear Left | 4MATIC Models Only |
| 2020 | Mercedes-Benz | C63 AMG | — | Rear Left | — |
| 2019 | Mercedes-Benz | C300 | AWD | Rear Left | 4MATIC Models Only |
| 2019 | Mercedes-Benz | C43 AMG | AWD | Rear Left | 4MATIC Models Only |
| 2019 | Mercedes-Benz | C63 AMG | — | Rear Left | — |
| 2018 | Mercedes-Benz | C300 | AWD | Rear Left | 4MATIC Models Only |
| 2018 | Mercedes-Benz | C43 AMG | AWD | Rear Left | 4MATIC Models Only |
| 2018 | Mercedes-Benz | C63 AMG | — | Rear Left | — |
| 2017 | Mercedes-Benz | C300 | AWD | Rear Left | 4MATIC Models Only |
| 2017 | Mercedes-Benz | C43 AMG | AWD | Rear Left | 4MATIC Models Only |
| 2017 | Mercedes-Benz | C63 AMG | — | Rear Left | — |
| 2016 | Mercedes-Benz | C300 | AWD | Rear Left | 4MATIC Models Only |
| 2016 | Mercedes-Benz | C450 AMG | AWD | Rear Left | 4MATIC Models Only |
| 2016 | Mercedes-Benz | C63 AMG | — | Rear Left | — |
| 2015 | Mercedes-Benz | C300 | AWD | Rear Left | 4MATIC Models Only |
| 2015 | Mercedes-Benz | C400 | AWD | Rear Left | 4MATIC Models Only |
| 2015 | Mercedes-Benz | C63 AMG | — | Rear Left | — |
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