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Cylindrical metal rear shock absorber with piston rod and mounting eye, silver-grey finish

Unity

Unity 12-512900 Rear Shock Absorber

SKU CH-6RDA-SAH3H

A twin-tube gas-charged rear shock absorber designed as a direct OE replacement for 2006–2012 Mercedes-Benz GL and ML models excluding Active Dampening Suspension

  • Twin-tube gas-charged design restores factory ride quality
  • Direct OE replacement fits 2006-2012 Mercedes ML & GL models
  • Excludes Active Dampening Suspension for precise application match
  • 50+ years Unity aftermarket expertise backs long-lasting reliability
  • Trouble-free installation reduces garage time and cost

Direct Replacement Rear Shock

The Unity 12-512900 rear shock absorber is a twin-tube gas-charged unit designed as a direct replacement for original equipment on select Mercedes-Benz models. It fits GL320, GL350, ML320, ML350, ML450, ML500 and ML550 vehicles produced between 2006 and 2012. The part targets owners restoring factory ride quality on these specific SUVs. It is not for vehicles equipped with Active Dampening Suspension (ADS).

Twin-Tube Gas-Charged Design

The twin-tube gas-charged construction aims to deliver consistent damping performance and long-lasting reliability compared to worn original units. Unity Automotive draws on over 50 years of aftermarket manufacturing experience to produce parts made for trouble-free installation. The design focuses on matching OE fitment without requiring modifications to the vehicle. No additional hardware or software is included with the shock absorber itself.

ADS Exclusion and Model Limits

This shock absorber explicitly excludes Mercedes-Benz models equipped with Active Dampening Suspension (ADS), meaning it will not function as a replacement on those specific trim configurations. Fitment is limited to the listed model years ranging from 2006 through 2012 for the GL and ML series. Installers must verify the vehicle does not have ADS before proceeding with this part.

How it compares

Measured against everything we stock in Brake Service Tools & Presses, at today’s prices. Recalculated every night.

Price $76.99
Cheaper than about 58% of the 1,702 comparable items (median $86.99).

Specifications

Product
Brand nameUNITY

Questions about this item

When will the twin-tube gas-charged rear shock absorber need replacement on my Mercedes-Benz ML350?

The shock absorber is built for long-lasting reliability as a direct OE replacement; replacement timing depends on driving conditions and mileage rather than a fixed interval.

What is the first limit reached under sustained heavy-duty use on a GL320?

The twin-tube gas-charged design manages heat buildup during continuous operation, with fade resistance as the primary performance limit.

How much noise and heat does the Unity 12-512900 generate during all-day driving?

The gas-charged twin-tube construction minimises internal friction and aeration, keeping operating noise low and heat dissipation consistent throughout extended use.

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