Stock pulley. Changed out a washer to fix the alignment and now I have the smaller pulley on it with a shoulder so it's not going anywere.
The smaller pulley will actually misalign worse vs. a larger one. But that notwithstanding, I hate this problem. you can either space out the pulley, sometimes use washers on the blower head-unit, or you need to look at your tensioner to see whether it is part of the cause.
If you get a laser for like $5 from home depot and you shoot it down the pullies, you'll probably see the mis-alignment. The _other_ way to do it is to get a straight-edge and use that to check alignment.
something has moved, though, and i can't tell what it is from the pics. so check the tensioner to be sure.
good luck!