Nut for belt tensioner

Hey guys, I'm looking for a replacement nut that holds tension on the belt tensioner bolt. I have been having hell getting the belt loose enough to remove and I finally just removed the whole power steering bracket. Then on further inspection noticed this nut had broke into 3 pieces.. I looked around on the Internet and could not find one. I'm not even sure what to call it. Any help on where to get one would be appreciated..

Brett

1991
4.0
XJ

OEM part number 53002915 ('88 to '96 XJ 4.0). Part name: Collar.

MSRP $15.50, discount $11.31 (plus shipping) from this source. Put in your Jeep info and the part number I posted.

http://www.wholesalemopar.com/parts_catalog-small.html?gclid=CK3WqZP3_KICFRJBDQod4Dr6oA

That's it!! Your awesome!