This is the 15000 series Duralast belt (0.44” wide) each pulley is labeled and you will see the water pump pulley is slightly different then the stock “car” water pump. (I was told they are the same numbers at my local flaps.
In the photo, your alternator looks like it’s sitting off line from the belt. Make sure all your pulleys are for the same belt width. When installing a belt, tighten belt, then rotate the crank and check tension again in different spots.
