ABS Wheel Speed Sensor Rear R / L 97-98 BMW E39 5 Series 528i, 540i 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: 34521182160 ALS431 AIRTEX/WELLS: BECK/ARNLEY: 5S10537 SU11990 0844142 DORMAN: 970115 *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 528I (1997 - 1998) BMW 540I (1997 - 1998)