Today, I'm planning to change out my serpentine belt.
I did a search and found this site with some helpful info.
He makes this comment...
"Addtional notes worth reading:
I have had numerous reports from readers that in 2002 Jeep changed the belt-tensioner square hole size to 1/2". So, you may need a 3/8" or a 1/2" breaker-bar depending on what year your vehicle is."
On my 2001 the hole is a 1/2".
Unless I'm looking at something wrong, the whole is between the pulley and mount/tensioner, right?