Dave,
First so you know more about the seats, there's an article on the 3B Page:
https://cj3b.info/RearSeat.htmlFrom my little bubble I only know of one main parts supplier: MDJuan. If any vendor lists a rear seat then it's probably from them.
A few minutes turned up these posts.
I found this one that even had plans to build one from scratch but alas, the images were all gone:
https://cj3apage.com/Forum/index.php?topic=2689.msg22461;topicseen#msg22461A while back, Rommel received a lot of input to address deviations. Here's a thread that shows specifically the rear seat:
https://cj3apage.com/Forum/index.php?topic=3858.msg32912;topicseen#msg32912I would conclude this is the best option if you can't find an original one on one of the selling/auction venues. If you do find one listed somewhere, you can compare it to the above article to figure out which type is being offered vs. what the seller may say.
There is another supplier of parts but so far, I don't see a listing for a rear seat of any kind - just some attachment parts scattered about:
https://www.sgireengus.com/Those that have gotten parts from SGI say the quality is good.
So, you find a vendor that either has one of these seats or can order one, read this article on a weak point and how to fix:
https://cj3apage.com/Forum/index.php?topic=4472.0Some aftermarket listings that are current right now:
eBay item number:143973717650
eBay item number:201095131403
Probably not what you're looking for but, I believe the aftermarket Smittybilt and BesTop rear seats could fit also but you'd have to add some brackets to fasten them to the wheel wells or floor - depending on your preference.
