Just some food for thought.
My dad had to order a tensioner pulley for his S/C'd Grand Prix and I feel like it could work on our setup.
The middle is recessed 1/4" on both sides, where as the OEM one is flush.
That's one of the main differences to note.
And there is are 6 groves on this one compared to the 5 on the OEM, but that isn't a big deal.
Here are some pictures of it (with loose measurements).
About 1" wide, 3" in diameter, 5/8" in diameter for the bearing hole.
Since the pulley is about an 1" wide, and the middle is recessed 1/4" on each side, then the bearing is about 1/2" wide.





This post has been edited by mkernz22: Apr 5, 2014 - 10:25 AM