For 2012-2015 Mercedes Benz ML350, the forward Ligh housing come from 2 types, HID and halogen. For HID one, the housing will have a clearly visible projector lens. For halogen one, you will be able to see the reflector by looking at them. So for two different types, the bulb size would also be different. This guide is accurate for 2012, 2013, 2014, 2015 Mercedes Benz ML350 equipped with OEM halogen or HID bulbs.We dedicated the time and effort to put together all the OEM bulb sizes and LED bulb options in one easy to read location. The information below is free, and for our visitors. This list is an ongoing project and we reserve the right to make changes at anytime. Use the information below at your own risk. We provide zero warranties for the information we compiled. Why are we saying this? We definitely don’t mean to worry you. We say this because sometimes bulb sizes and kits can differ even within the same make, model, and year. The exact production month can sometimes make a difference in bulb sizes used. That makes it nearly impossible for us to be 100% certain the information below will be correct for your ML350. We just want you to know there’s always that 1 percent chance it’s wrong, for your truck, for whatever rare reason. 2012-2015 Mercedes Benz ML350 Bulb Sizes (Click to Order) Exterior Light BulbsDaytime Running Light Bulb Size: LEDDaytime Running Light Bulb Size (w/HID Forward Lighting): LEDFront Turn Signal Light Bulb Size: 5200 BulbsFront Turn Signal Light Bulb Size (w/HID Forward Lighting): LEDFront Side Marker Light Bulb Size: W5W BulbsFront Side Marker Light Bulb Size (w/HID Forward Lighting): LEDRear Turn Signal Light Bulb Size: LEDReverse Back Up Light Bulb Size: 921 BulbsBrake Light Bulb Size: 7506 BulbsTail Light Bulb Size: LEDLicesnse Plate Light Bulb Size: LED Interior Light BulbsTrunk Light Bulb Size: LEDDome Light Bulb Size: LEDMap Light Bulb Size: LEDVanity Mirror Light Bulb Size: 2825 BulbsGlove Box Light Bulb Size: 2825 BulbsStepwell Light Bulb Size: 2825 BulbsInterior Door Light Bulb Size: 2825 Bulbs If you want to know how to find the bulb size for 2012-2015 Mercedes Benz ML350 fast, we have the whole package LED bulbs list for 2012-2015 Mercedes Benz ML350.