Unity 12-512800 Shock Absorber - Rear
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Unity
 Gas Charged Shock Absorber

Unity 12-512800 Shock Absorber - Rear

Brand Unity 12-512800
Position Rear
Collapsed Length OEM
Extended Length OEM
Shock Stroke OEM
Product line Gas Charged Shock Absorber
Fits Mercedes-Benz · 14 vehicles

OEM specifications. Built to match original shock dimensions and stroke.

Gas charged design. Delivers consistent damping for a smoother ride.

Suspension shock absorber. Helps control spring movement and improve stability.

Cross-references 4J-2015S for the same application. See all 1.

$132.35Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Shock Absorbers are typically replaced in pairs, axle by axle.
Order total $132.35
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Rear Gas Charged Shock Absorber for Mercedes-Benz

The Unity 12-512800 is a rear gas charged shock absorber built to OEM dimensions for select Mercedes-Benz applications. It is specified with OEM collapsed length, extended length, and shock stroke to support proper suspension geometry and consistent rear ride control.

Compatible with 2006-2013 Mercedes-Benz R350 rear, 2007-2009 Mercedes-Benz R320 rear, and 2006-2008 Mercedes-Benz R500 rear, this shock absorber is a direct-fit suspension replacement for vehicles excluding Adaptive Damping Suspension (ADS). The Unity gas charged shock absorber line is engineered for OE-style fitment and dependable service in everyday driving conditions.

  • OEM collapsed length for correct installed fit
  • OEM extended length to match factory suspension travel
  • OEM shock stroke for consistent rear damping range
  • Gas charged design for stable response and controlled rebound
  • Rear suspension shock absorber for Mercedes-Benz R-Class applications
  • Part number 12-512800 for easy catalog matching

Fitment Details

  • Fits 2006-2013 Mercedes-Benz R350, rear; excludes Adaptive Damping Suspension (ADS).
  • Fits 2007-2009 Mercedes-Benz R320, rear; excludes Adaptive Damping Suspension (ADS).
  • Fits 2006-2008 Mercedes-Benz R500, rear; excludes Adaptive Damping Suspension (ADS).

What This Shock Absorber Helps Address

  • Excessive rear bouncing after bumps or dips
  • Reduced damping control from a worn shock absorber
  • Rear-end instability during braking or cornering
  • Uneven ride quality caused by suspension wear
  • Noise or harshness from a fatigued rear shock

Installation Notes and Tips

Verify that the vehicle does not use Adaptive Damping Suspension (ADS) before ordering or installing. Confirm rear-position application and match the original shock dimensions to the vehicle’s suspension setup. For best results, inspect related rear suspension components for wear during replacement.

Quality Assurance

Unity Automotive has more than 40 years of aftermarket suspension manufacturing experience and builds this gas charged shock absorber to OEM specifications. The 12-512800 is part of Unity’s suspension-focused product line, developed for accurate fitment and consistent performance in Mercedes-Benz R350, R320, and R500 rear applications.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Related reading

This part fits 14 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2013Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2012Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2011Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2010Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2009Mercedes-BenzR320RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2009Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2008Mercedes-BenzR320RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2008Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2008Mercedes-BenzR500RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2007Mercedes-BenzR320RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2007Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2007Mercedes-BenzR500RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2006Mercedes-BenzR350RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
2006Mercedes-BenzR500RearExcludes Adaptive Damping Suspension (ADS); Gas Charged Shock Absorber
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
4J-2015S