You can check the alignment with a straight edge across the alt pulley. The straight edge should be perpendicular to the driving pulley. Get that right first, then use the straight edge to get the front to back alignment. Be sure the alignment doesn't change when the belt tension is applied. Look at the pivot bolt hole in the alternator. If it has been run loose in a previous life, the hole may be wallowed allowing the front to tip down.
Look closely at the driving pulley. Be sure it isn't cracked or rough. Also the sides of the pulley should be flat, not worn concave from a slipping belt.
What did that pulley originally drive? Can you look at a factory belt and get the width? With that information you can order a belt the length you need and know it is the right width for the pulley.
Then, compare that belt to the alternator pulley, see if it is the right width and angle.
And, yes there are many different pulleys available for the alternator. Probably the best source would be a starter/alternator repair shop. They probably have every size ever made in the bone pile.
One other thing, from the looks of the failing belt, it looks like something may be touching the back side of the belt, or a broken or bent pulley.
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