1、OE Number: The referencing OE number of this xenon hid ballast control unit are 8K0941597C, 8K0941597C, 8K0941597B, 2048703226, A2048703226. 2、Fitment: The headlight ballast control unit module is a replacement for A1 2011‑2015, for A3 S3 Facelift models from 2009, for A4 S4 B8 starting from 2009, for A5 2008‑2014. 3、Function: The high performance ballasts can effectively convert voltage, stabilize current and protect pulse surges to ensure that headlamps work in a safe environment. 4、Material: Made of premium aluminum alloy for better heat dissipation and vibration resistance performance, can be mounted on the left and right of the headlight. 5、Easy Installation: Easy to install, no modification, cutting, or drilling required. It adopts original standard, which is a perfect replacement and can perfectly match to your car. Item Type: Xenon HID Ballast Control Unit OE Number: 8K0941597C, 8K0941597C, 8K0941597B, 2048703226, A2048703226, 8K0941597 Material: Aluminum alloy Installation Position: Mounted on the left or right of the headlights Fitment: Fits for A1 2011 - 2015 Fits for A3 S3 Facelift models from 2009 Fits for A4 S4 B8 starting from 2009 Fits for A5 2008 - 2014 Fits for A6 S6 C6 C7 Facelift models from 2009 Fits for A7 2011 - 2014 Fits for A8 S8 D4 starting from 2009 Fits for Q3 Q5 Q7 starting from 2009 Replacement for Chrysler 300C - from 2011 Replacement for Lancia Thema LX - from 2009 Fits for 991 981 Macan - from 2012 Replacement for Seat Alhambra - from 2011 Fits for Octavia III / SuperB - from 2013 Fits for Caddy (2011-2015) Fits for CC (2012-2015) Fits for Sharan II (2) 1 x Xenon HID Ballast Control Unit