This Xenon HID Headlight Unit Ballast A1669002800 Q03 is a high-quality replacement part for your vehicle's headlight assembly. It is a direct replacement with a manufacturer warranty of 1 year. The ballast is suitable for use with xenon lighting technology and is designed to fit the front left side of your vehicle. The part numbers that are interchangeable with this product include A1669002800, A166 900 28 00, 166-900-28-00, 6312 7255 724, 6311 7237 647, 6312 7296 090, and 6311 7356 250. The manufacturer part numbers include 1669002800, 1 307 329 312 01, and 130732931201. This headlight assembly is a great choice for anyone looking to replace their vehicle's headlight ballast.