Only Fit For BMW E8X E9X N55 Engine. The N55 engine only uses one serpentine belt but that one serpentine belt is responsible for driving the alternator, power steering pump, and A/C compressor. Drive Belt Pulley Tensioner Kit with Bolt For BMW 335i 135i E90 E91 E92 E93 E82 E88 X1 E84.
