The O-ring change went surprisingly easy. I pulled the oil filter, and covered it up since I was going to re-use it. I punched the bit out of the socket and used a 10mm wrench over the bit and an old lacrosse pole over the wrench to break it loose. Once loose I used a 10mm ratchet wrench to pull it all the way out.
The large o-ring that seals the adaptor to the block was hard as a rock and completly flat. The o-rings on the bolt looked ok, but since new ones came in the kit I replaced them too. Before I put everything back on I cleaned everything real well and then bolted everything back up. I added a little oil to make up for the little bit that came out when pulling the filter off.
I took the Jeep for a test drive, to check and see how it worked. The temp gauge never even made it to 210, so it looks like the overheating problem is fixed. When I got back from the 15 min test drive, the first thing I noticed was no buring oil smell.
I crawled under the Jeep and couldn't find any oil leaking at all. I'm going to keep a close eye for leaks but with a little luck the rear main seal is ok and the oil filter adaptor was the leaking so much oil that it made it look like a rear main seal. I doubt I'll get that lucky, but it has cut the leak down significantly.
I also added my "Mall Crawler" sticker.