ABS Wheel Speed Sensor Rear R / L 99-03 BMW E39 Wagon 525i, 528i, 540i, M5 In order to avoid return hassle and save yours and our time, you must cross-check indicated reference part numbers against those found on your old unit. Do not rely on vehicles compatibility list, which is presented for the reference purpose and shouldn't be your guide to determine compatibility. If you are unsure, you may call local dealership (auto parts dept.) to obtain correct part numbers or ask your mechanic. If you would like us to help you, please contact us and provide your vehicle's detailed info such as: Make/Model/Year/Engine/Full VIN# and we will do our best to find compatibility. PART REFERENCE NUMBERS: BMW: STANDARD MOTOR: 34526756377 34520025720 34521165536 ALS1788 AIRTEX/WELLS: FLENNOR: 5S10538 SU11991 FSE51517 *Please cross-check indicated OEM reference codes against those found on your current unit. You may call local dealership (auto parts dept.) to obtain correct numbers. COMPATIBLE VEHICLES: * Fits rear right or left side (indicated price is for 1 sensor). Models presented for reference purpose only! Make: Model: Year: BMW E39 Wagon 525i 1999-2003 BMW E39 Wagon 528i 1999-2003 BMW E39 Wagon 528it 1999-2003 BMW E39 Wagon 530i 1999-2003 BMW E39 Wagon 540i 1999-2003 BMW E39 Wagon M5 1999-2003