1、Fitment: Replacement for GL 320 Bluetec 4Matic 3.0L V6 Diesel 2009, replacement for GL 320 CDI 3.0L V6 Diesel 2008, replacement forGL 320 CDI 3.0L V6 Diesel 2007, replacement forGL 450 Base 4.6L V8 ‑ Gas 2009. 2、OE Number: A1648208185, A2118709126, A1644420203, A1648701726, A1648702785, A1648708185, A1648704126, 1648208185, 2118709126, 1644420203, 1648701726, 1648702785, 1648702785, 1648704126. 3、Durable Material: Made of advanced aluminum alloy material, with heat dissipation, vibration resistance, wear resistance, high temperature resistance, oxidation resistance, strong and durable characteristics, to ensure long service life. 4、Practical Function: The main function of the ballast is to convert voltage, stabilize current and protect pulse surges to ensure that the headlamp works in a safe environment and extend its life. 5、Simple Operation: It can be used to replace the xenon ballast module unit of the refurbished original car which is damaged and old. Plug and play replacement is done without the need to program or code the car. Item Type: Xenon HID Headlight Ballast Bulb type: D1S Installation Type: Direct replacement, plug and play, no coding or programming required Installation Position: Left or right headlamp Application: New aftermarket headlamp Xenon ballast module units are available for direct replacement of your existing parts, designed to meet or exceed OEM specifications with plug and play replacement without coding or programming Interchange Part Numbers: A 164 820 81 85, A1648208185, 1648208185 A 211 870 91 26, A2118709126, 2118709126 A 164 442 02 03, A1644420203, 1644420203 A 164 870 17 26, A1648701726, 1648701726 A 164 870 27 85, A1648702785, 1648702785 A 164 870 81 85, A1648708185, 1648708185 A 164 870 41 26, A1648704126, 1648704126 Fitment: Replacement for GL 320 Bluetec 4Matic 3.0L V6 Diesel 2009 Replacement for GL 320 CDI 3.0L V6 Diesel 2008 Replacement for GL 320 CDI 3.0L V6 Diesel 2007 Replacement for GL 450 Base 4.6L V8 Gas 2009 Replacement for GL 450 Base 4.6L V8 Gas 2008 Replacement for GL 450 Base 4.6L V8 Gas 2007 Replacement for GL 550 Base 5.5L V8 Gas 2009 Replacement for GL 550 Base 5.5L V8 Gas 2008 Replacement for ML 450 Hybrid 4Matic 3.5L V6 Electric/Gas 2011 Replacement for ML 450 Hybrid 4Matic 3.5L V6 Electric/Gas 2010 Replacement for ML-Class (W164 2008-2011) Facelift 2008-2011 Replacement for GL-Class (X164 2009-2012) Facelift 2009-2012 1 x Xenon HID Headlight Ballast