I am a bit of a noob with car audio, I have installed a few headunits into various cars, as well as amps and subs, but this baffles me. I bought a wire harness for a 91-97 ford explorer, and it comes with 2 harnesses. One fits and the other doesn't, the one that fits doesn't seem to have any speaker wires, while the one that doesn't fit has everything, +/- for FL, BL, FR, BR. Am I missing or doing something wrong here? It was a stock cassette deck and I am putting in a Pioneer cd unit that I had in my old car. I included a picture I found online, the one on top does not fit but seems to have all the wires for the speakers etc, while the one on the bottom only has like, 6 wires, and confuses me a lot. Any ideas or am I just not seeing something?