This is crazy, but my previous 2wd black t4r had the same bend.
Mines too, had zero markings underneath and was clean as it looked like it came from factory.
I had a bend in it and if i remember correctly i even posted a thread about it a while back.
It had the same bend and i could not figure it out at all, what was even more crazy was that 2wd 4runner never really got much time offroad and if it did, it was very minor stuff back then.
I still till this day cant think of how it happened.
BUT there is good news, after i replaced it with a straight one from a junkyard i cut the end off the bent old one and now i use it ever now and then as a solid breaker bar.
any ratchet will fit right in the tube and i have never found a bolt i could not break loose without it.
haha let me see if i can find that thread..
EDIT: Found the thread.. but with a more interesting twist to my story...
Mines was bent there, but the other way around!?! haha even more of a mind bender.. why would mines be bent the other way around, even more so impossible for it to happen offroad haha.
link to thread if your interested:
http://www.toyota-4runner.org/3rd-gen-t4rs/87618-panhard-crooked-pics.html