You could probably fab up a quick adapter plate that would attach to your stock seat brackets with some angle stock from Lowes or Home Depot. I've seen it done with aftermarket seats in a mustang, so can't be much different in a jeep. Just get the pieces that already have a bunch of holes in them, or you can just drill your own.
2004 Grand Cherokee Overland - "Couldn't keep it stock" DD
OME HD springs - Fox/BDS shocks - 255/70/17 Toyo AT2
1998 Cherokee Classic - SOLD - White - 5" lift - 35" tires - locked/geared/shafted/armored