[BOSCH EXPERTISE] - Bosch 100% new alternators benefit from more than 100 years of alternator manufacturing experience, ensuring years of reliable charging performance, even under the most extreme operating conditions [PROVEN RELIABILITY] - Engineered, manufactured, and 100% tested to the highest industry standards Bosch is famous for, using all new, not remanufactured, components for maximum reliability and performance [100% NEW COMPONENTS] - Bosch 100% new alternators incorporate only original equipment quality components to withstand the rigors of high heat environments and high electrical demand [ADVANCED ENGINEERING] - Identical in fit and function to the OE parts they replace, yet benefiting from the latest enhancements in engineering and charging technology for exceptional performance [ENHANCED CAPABILITY] - The ideal solution for certain problematic late-model applications that place an extreme burden on unit components in a high-heat environment 120 amp rating; With "clutching" pulley; Compatible with select vehicles (Note: vehicle trim level/engine may affect fitment - verify specific fitment details with fit checker above): BMW: 2001-06 325Ci, 2001-05 325i, 2003-05 Z4 Replaces the following Original Equipment and Aftermarket part numbers: 1986A00851, 12317519618, 12317519620, 7515317, 0124515223, 0124515105, AL0816N, 1986A01176