Maybe it's me but your question is not very clear. If you are planning to replace a Toyota radio with cassette with a newer Toyota unit that has both cassette and CD you should not need any new cables. They are probably both double DIN. The factory wiring was the same from 1984 to about 2003. If you are switching to a "new" factory 3rd gen system you will need the factory amplifier and the associated cords that go with it. I notice some on eBay have the plugs cut off. Useless. The amp fits right below the stereo in the 3rd gen. Any pictures of what you have? This is the amp. Missing a plug.
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1989 4Runner Build thread:
http://www.yotatech.com/f199/nervo19.../#post52231244
2000 4Runner & 2000 Tacoma TRD Off Road
2008 4Runner & 2016 Tacoma 4x4 Dbl Cab TRD Sport