General description Common problem when your car xenon headlight stops working is a faulty ballast module. Replace it instead of the whole headlamp assembly. This product is suitable for both left and right sides and is compatible with all engine types, making it a direct replacement part that is easy to install with a plug-and-play design. Each headlight requires one unit. Technical specifications Type: HID Xenon Headlight Ballast Condition: 100% Brand New Part Numbers: W3T21571, W3T216, W3T21671 Compatible Part Numbers: W3T24571, W3T24771, W3T23371, 33119--G01, BHN3510H3, 8301C463 Color: Silver + Black Material: Metal + Plastic Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with Honda Civic, Mazda 3, and Outlander Compatible models include: - Mazda 3 (2013-2017) - Mazda 5 (2013-2015) - Mazda 9 (2013-2015) - Mazda CX-9 (2012-2015) - Mazda Z (2011-2016) - Mazda V (2012-2015) - Mazda Z (2012-2014) Installation Direct replacement part Plug and play