Compatibility: This ABS Wheel Speed Sensor fit for 2001-2003 BMW 525i, 2001-2003 BMW 530i, 1999-2003 BMW 540i, 2000-2003 BMW M5, 1997 1999-2000 BMW 528i Replace OEM: ALS435, 34520025724, 34521165535 Position: 2Pcs ABS Wheel Speed Sensor fit for the Rear position (Left Side and Right Side) Service & Warranty: 1 year limited warranty. Any problem, we will resolve in 24h (refund/ replace/ offer technical support) OE quality: ISO/TS 16949 certified, tested to the strictest OE standards, also improved those traditional design weaknesses, to ensure vehicle fitment and product reliability