I came across another jeeper who had the same problem.
No rust anywhere and this one body mount bolt area rusted thru.
He ended up with a donor tub, cut out the rusted part and welded in the metal area.
I bought the floor pan from the same tub.
I drive a 1999 Sahara and my son drives the 1999 SE
only right now he has the Sahara and I have the SE
while it is being fixed up.