Original B-Pillar Seat Belt Height Adjustment Slider Mechanism / A0008600388

Original factory slider mechanism with button for adjusting the height of the upper mounting point of the front seat belt (B-pillar seat belt height adjustment guide / seat belt slider – Gurthöhenverstellung / Seat Belt Height Adjuster Mechanism), designed for Mercedes-Benz C-Class (W205 / S205 / C205 / A205 generation) models produced between 2014 and 2021, including petrol-powered, high-performance CDI/d, hybrid, and AMG variants (C43, C63, C63 S), based on the modular platform with rear-wheel drive or all-axle drive MRA (Modular Rear Architecture).

Original OE Mercedes-Benz group passive safety system component. Made of hardened structural steel with high tensile strength and technical POM/PA plastic resistant to abrasion and fatigue cracking. Responsible for precisely setting the seat belt webbing's drop angle relative to the driver's or passenger's height. Equipped with an internal ratchet mechanism with a return spring, which ensures rigid and secure locking of the position under dynamic load during sudden braking or a collision. Features an integrated pass-through and anchoring point for the upper ear of the seat belt pretensioner.

Technical specifications:

• Catalog part number (OE): A0008600388 / A 000 860 03 88 (and related notations: 0008600388, integrated revisions from the A0008600488, A205860...)

• System / Category: Seat belts, SRS system and interior equipment / Seat belt height adjustment mechanisms, B-pillar sliders (Seat Belt Height Adjuster / Gurthöhenversteller)

• Function: Incremental adjustment of the upper seat belt anchoring point height, position locking under load

• Installation side: Front – left side (driver) or right side (passenger) – B-pillar internal mechanism

• Material: Hardened steel, electroplated zinc (corrosion protection) + high-density polymer components

• Mounting location: Internal B-pillar frame structure (under the plastic pillar trim)

• Dedicated model: Mercedes-Benz C-Class (W205 type – Sedan / S205 – Estate / C205 – Coupé / A205 – Cabriolet)

• Steering wheel side: Left (LHD) and Right (RHD) – symmetrical element

• Condition: Original part, used (100% functional – in very good condition, ratchet mechanism operates precisely, locking teeth without wear, return spring is strong, body is straight – the element comes from a non-accident car, did not participate in the firing of the pyrotechnic pretensioners)

• Manufacturer: Mercedes-Benz AG / Autoliv / TRW (OEM Original)

Main application:

• Mercedes-Benz:

  • C-Class Limousine / Sedan (W205 type) – model years 2014 to 2021

  • C-Class T-Modell / Estate (S205 type) – model years 2014 to 2021

  • C-Class Coupé (C205 type) – model years 2015 to 2021 (selected pillar configurations)

  • GLC-Class / GLC Coupé (X253 / C253 type) – model years 2015 to 2022 (MRA platform with the same module)

Fitment guarantee and VIN verification

Each slider mechanism undergoes a mechanical test for smooth movement, automatic locking in extreme and intermediate positions, and absence of lateral play.

Fitment / installation tip: The initial designation A000 in the 860 / 0388 safety group defines the seat belt anchoring mechanism meeting the Daimler group's strict crash standards. A typical symptom of wear or damage to the B-pillar mechanism is the seat belt dropping under its own weight, the adjustment button sticking on the upholstery, or the locking teeth wearing out after a collision when the belt was pyrotechnically pretensioned. Replacement involves removing the lower and upper B-pillar covers, unscrewing the factory mounting screws securing the mechanism to the body structure, and re-routing the seat belt ear. Using the original OEM mechanism guarantees full passenger safety and precise slider operation from the upholstery position. Before purchase, we recommend comparing the OE number stamped on the steel body or verifying it using the vehicle's VIN.