Ⅰ. According to the factory specifications, match for the car. Ⅱ. Own different test machines to design exact accurate parameter for products. All items were tested for performance. Ⅲ. Made by material, anti-rust, colorfast. Ⅳ. Aftermarket product. Ⅴ. Stable performance, high reliability, suitable for replacing broken one. Ⅵ. Condition: Ⅶ. Manufacturer Part Number: 4G0907397Q Ⅷ. Other Part Number: 4G0907397Q Ⅸ. Interchange Part Number: 4G0907397Q Ⅹ. Type: Headlight Ballast Ⅺ. Mounting Style: Screw-On Ⅻ. Lighting Technology: Xenon ⅩⅢ. Fitment Type: Direct Replacement ⅩⅣ. Fitment: ⅩⅤ. For A3 8V 2012-2016 ⅩⅥ. For A6 C7-4G 2014-2017 ⅩⅦ. For Q3 8U 2014-2018 ⅩⅧ. For TT FV_8S 2014-2018 ⅩⅨ. For 2015- ⅩⅩ. For Rapid 5J 2017- ⅩⅪ. For SuperB 3V 2015- ⅩⅫ. Colour: Silver ⅩⅩⅢ. Material: Metal ⅩⅩⅣ. Package Contents: ⅩⅩⅤ. 1x Headlight Ballast ⅩⅩⅥ. Only the above package content, other products are not included. ⅩⅩⅦ. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.