The Bilstein 04-07 BMW 525i B3 OE Replacement Coil Spring - Front is a direct-fit replacement part designed to restore the original performance of your BMW 525i. It features a corrosion-resistant powder-coated finish and is constructed from high-quality steel for long-lasting durability. This coil spring is designed to deliver a smooth ride and improved handling, while providing the same level of comfort as the original part. It is a perfect replacement for worn-out or damaged OEM parts, and is backed by a limited lifetime warranty.