I located the plug I think I needed. My AM/FM radio is a model # 86120-89118 version. Does that help? I'm assuming it's a 4 channel from what I've looked into.
First of all, wtf Toyota with all the different wire colors across the years of an FJ60?
This set of wires are supposed to be for the speakers and radio (power and ground) but none of the two wiring diagrams I've seen show these colored wires shown in the attached picture.
Btw, how many...