Just a idea, not sure if it is covered already .... I admit I did not read all the replies.

https://www.tanksinc.com/index.cfm/p...=cat/cat68.htm

This is where I bought the tank for my old Dodge and it was pretty much bolt in and is a nice tank. I like that I can install a in tank fuel pump, got a new sending unit with it, has a drain plug on it, is easy to connect lines to ..... it works for me and would buy from them again.

While they do not have your exact tank listed, they do show photos of all tanks and give dimensions for each tank.
Get all your information from your tank and then search other models ... they do have Jeep tanks in your year range ..... they have a universal tank section with many variations.

I guess we know plastic does not last forever, gets brittle and cracks .... A galvanized tank for about $300 should last the rest of your lifetime.