Dorman 419-039 Automatic Belt Tensioner. Fits what vehicles: 2003-2010 Dodge Ram 2500, 2003-2010 Dodge Ram 3500, 2005-2010 Dodge Ram 4000, 2008-2010 Dodge Ram 4500, 2008-2010 Dodge Ram 5500, 2011-2021 Ram 2500, 2011-2021 Ram 3500, 2011-2013 Ram 4000, 2011-2021 Ram 4500, 2011-2021 Ram 5500.
