39389 Automatic Belt Tensioner w/Pully Compatible with 2011-2019 BMW 535i 335i M135i X3,X5,X6 F30 F10 F01 F02 E70 X5 F20. Integrated Functionality: This assembly includes both a drive belt tensioner and pulley, powering essential components like the AC generator, power steering pump, and air conditioning.
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