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Part number 278950 in the original Maserati catalog: where it sits in the assembly and what the factory calls it.
Belt Tensioner Idler Pulley Kit for Maserati Ghibli, Levante, and Quattroporte. Part numbers include 278950, 278940, 286570, and 243857. Designed for Maserati vehicles featuring the Ferrari F160 3.0 L Twin-Turbo V6 engine M157. Type: Drive Belt Kit. Includes 1 short alternator belt, 1 drive belt tensioner, and 2 drive belt pulleys, as shown. Located in Burlington.
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