[longress]

There's only one for each belt. The main belt has a plastic cover that needs removed covering the torx or hex (can't remember). Swing the tensioner down to create slack to pull the belt. Pull the belt over the alternator pulley to remove and when reinstalling the last pulley the belt is slid over is that same pulley. Make sure you draw a diagram of how the belt is routed.
I know what you're saying now. The other pulley is an idler pulley. The tensioner (lower pulley of the two)you can see has the ability to move the idler does not. Sorry if that sounds dumb ��