I had an 88 put into my 83 until I re-build the correct seat. New holes had to be drilled in the floor as the bolts did not line up with the original mounting points. Once it's in it looks and works just fine.
I've run Cooper Discoverer A/T on a Jeep Liberty and a Jeep Wrangler. I have no experience with the M/T model but I have always been happy with Coopers in the snow. The M/T tread looks like it would do the job off road.