The Bilstein 04-07 BMW 525i B3 OE Replacement Coil Spring - Front is a high-quality, direct-fit replacement part for your BMW. It is designed to restore your vehicle's original ride quality and performance. It is constructed from premium-grade materials for long-lasting durability and superior performance. It is also corrosion-resistant and offers superior stability in all driving conditions. This coil spring is an excellent choice for restoring your vehicle's performance and ride quality.