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I havea 2004 intenational 4300 that never had a radio in it, however the speakers and antena is there for a radio> Found the 12 pin conector off factory wire harness. Also found a 6 pin conector in factory wire harness. I am awsuming both of the pins
September 20th, 2014
The 12 pin if it is small white in color is the radio harness.  You would use the BT PAN CAS to plug into it and wire the other end to your new radio.
The small harness is most likely an option pluge if male would plug into the factory radio as well.  You will not use it for an aftermarket radio.