I have a 2003 Dodge Dakota 4.7 I need a serpentine belt with a/c. I need to know the length. Can anyone help with this?

 

It calls for two different belt lengths. Measure your tensioner pulley diameter.
76mm diameter takes an 88" belt length Gates number K060876.
90mm diameter takes a 88-3/4" belt Gates number K060882.
Your other option is to take the belt in to a parts store and have them measure it with their tool.