The below engine parts Cummins belt tensioner are for the 4BT3.9/6BT5.9/6CT8.3/6LT8.9/ISDe/ISLe/ISZ/M11/NT855/ KT19/KT38/KT50/ISF2.8/ISF3.8/ISM11/QSM11 series. Part Name Part No. Part Name Part No. Belt Tensioner Bracket 3900035 Belt Tensioner 3973820 Belt Tensioner Bracket 3930838 Belt Tensioner 3976831 Belt Tensioner Bracket 4928989 Belt Tensioner 3976834 Belt Tensioner Bracket 4960155 Belt Tensioner 4891116 Belt …