There is no complete engine bolt kit for the Jeep 4.0L. Other than the cylinder head, main bearing, and connecting rod bolts the rest can be replaced with bolts from a hardware store.
Fel-Pro ES71102 for the cylinder head
ARP Connecting Rod Bolts
http://hesco.us/shop.asp?action=details&inventoryID=42910&catId=7549
Main Bearing - You might have to get these from the dealership. Hesco sells an ARP stud kit that is compatible, but not like the factory style.
http://www.hesco.us/shop.asp?action=details&inventoryID=42905&catId=7757