O’Rielly’s can order them in.
Also never assume a new/rebuilt part is any good. Story after story on this site of parts that are bad out of the box or failed shortly after.
One other thought, do your pulleys all line up? Perhaps The belt is sliding on your smooth pulley’s to move over for the next pulley that sticks further in or out. Thus chirping?
I agree with
@Big Bart, you said they look straight. Have you used a laser, or a straight edge placed across the pully face butted up against the next pully or measured to the rear rib? Something that would give you a point of reference from pulley to pulley. Difference might be too small to measure or within tolerance.
I have never run into this problem except when the belt is due for replacement.
Thinking unorthodox, what about taking an old belt and cutting a couple ribs off, place it in the center, start the vehicle and see if it wants to walk one way or the other. Maybe the chirp is the shoulder of one pulley keeping the belt on?
V-belts for the win....haha. Honestly good luck!