can't say for sure, but wrangler leafs are fairly flat. maybe not as flat as an XJ, but certain have less arch than an MJ. As I found out with my experimenting, that third leaf is crucial for holding up an MJ. pulling it makes the leafpack flatten out quite a bit. :(
I still say the original poster just needs to find a better junkyard. that one is a ripoff.
http://www.jmw4x4.com/inventory/retail.htm seems to have a few sets.