found the old belt ref 11AVI1285, this is the metric size, 11mm width. by 1285mm length, this is with the AC compressor. the caliper agreed for the width 11mm, in fact 10.5 mm .
in your case you need a shorter length than your current one, check the ref printed on the belt.
check in my signature, engine bits, one pict shows how deep the belt is...
no access to that jeep at the moment,to give you the current refnum, I can't see in the pict
EDIT after Will e post, the other ref on the belt mentioned above is 15512