It includes the belt tensioner, serpentine belt and both idler pulleys. Fits Mercedes E320, E350, ML350, ML320, Sprinter 2500 RWD, Sprinter 2500, GL350, R350, GL320, Sprinter 3500 RWD & more. AAZ Preferred MB2BELTKIT Drive Belt & Tensioner Kit - Mercedes. If the declutching pulley has seized, it will greatly shorten the life of the belt tensioner and often causes the pulley to break off or a fracture of the pulley arm. ... Serpentine Belt 2002-2003 Sprinter. $29.97. View; Serpentine Belt 2004-2006 Sprinter. $28.00. View; Auxiliary A/C V.