I just rebuild my own patches and steal on. If those plates are rusted.. mostly the inner frame is rotted up as well. The wheel arches behind the tank maybe rotted through.
Labor rates are costly. The driver side shock coil plate wraps around that pipe and welded near the top. No way to weld a new plate in without removing the tank.
I would clean out the crossmember pipe and weld a new pipe inside of it so if the pipe is thin. You have steel to weld the plate back too.
I can see that having some costs to it as it takes alot of time. To get that all apart. As depending how rusty, could need a tank, the lower control arms strengthened with more steel .
If they are very good at it. I can see that being thwt cost or more.
I have no idea how rusted your rig is underneath. So that would change the cost depending on what is what..
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html