speaker wire

My 1999 xl standard cab has factory am/fm radio with speakers in the door. My radio does not have a fade from front to rear feature...nor a left/right balance. I desire to replace with a factory am/fm cassette deck. Behind my seats are speaker grills, but no speakers. Any advise will be...

I just bought an '89 Eddie Bauer Bronco II. The radio was gone, just wires hanging out. The wires hanging from where the radio had been do not match up to any of the wires at the speaker connections. The wires at the actual speaker connections are the correct colors as shown on the web site...