GooDeal HID Xenon Ballast Igniter 89035113 for Audi A4 S4 D1S D2S D2R LAD5GL 4Pin 12V Replacing OE#: 3D0 907 391 B / 088794 4 Pin Connector. Please check your ballast is 'LAD5GL' type with 4-pin connector. The ballast can be used directly with D1S or D1R HID bulb. It can also be used for D2R or D2S HID bulb with D2 igniter attached (not included). Package Include: 1 x HID Xenon Ballast Igniter as pictured Please refer to compatibility chart below for specified vehicle information and check the part number before purchasing to ensure fitment.