I don't believe there's an aftermarket OEM replacement available. Best bet is to find someone parting a truck & willing to pull & ship a good used
tank or put in a Long Range Tank Upgrade. "Cruiser Brothers" Sells them.
Sounds like a vacuum leak to me. Carefully check the large intake hose from the air Cleaner to the Throttle Body.
That corrugated section can hide a split in that piping. I'd carefully remove it and inspect it thoroughly.
Loaded (5) 6x6x10 pressure treated post on the roof rack I had built. Handle the load just fine, plenty stout. I wouldn’t want to perform any evasive maneuvers with that load up there. All in all very pleased.
You can tighten that up at the end of the Tie rod. Remove the cotter pin and tighten the adjuster all the way in then back it off about 1/2 to a full turn
and reinstall the cotter pin. I've always find the new tie-rod ends have a bit too much slop in them for my taste.
Sorry, I don't see a ton of options here.
Once sheet metal gets that hot it's never the same, damn near impossible to get all the buckling out of it. That things roached.
1. Try finding an FJ62 with a blown engine / No Engine and Transplant the drive train.
2. Try finding an FJ62 with a Rusted...
Well..... I really hate seeing folks get defeated and frustrated I've been to this point working on my trucks. This is an open invitation, If you can get your rig and parts up to my place in Calhoun, Ga. we can get it into my basement and knock it out.
I really don't think there's a vendor out there that makes a true 4" lift kit for an FJ60 you'll have to go to a custom set. or build your own
hybrid set, plenty of previous threads on this subject. Search and you shall find.
As far as vacuum leaks. you'll have to fix'm or replace. Being your in...