Yes the other users are spot on as if you frame is rotted so is your bumper mounts and floor pan were that hooks up to. Use my build thread as to how to fix your frame as DIY. Randy and I rebuld frames. So you can see how to do it as that's your best bet at this point. I wouldn't hook anything to a oem bumper nor those body mounts that support it.
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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