The Bilstein 18-19 BMW X3 / 2019 X4 B4 OE Replacement Strut Front Left is an original equipment replacement strut designed for the BMW X3 and X4 models from 2018-2019. It features a monotube gas pressure construction that provides superior handling and performance. It also features a self-adjusting deflective disc valving that provides a smoother ride and improved control. The strut is designed for a direct fit, and is corrosion-resistant for long-lasting performance.