Honestly, you really better off to keep the wiring matching the truck chassis then trying to go from 99 to pre 99. Like it's better to put the pre 99 wiring etc into the 99 door. With the pre 99 Power window switch and be done..
Pre 99 truck don't have the multiplex communication bus built into the body harnesses. Is why I am suggesting this.
So your going from 99 to what chassis year?
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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