Ok so my 91' infinity M30 drives great. But the bose speakers are shot. We replaced them with aftermarket planet audio speakers. We took the main center dash piece off and took the tape deck out. We have an aftermarket headdeck that fits perfectly in the stock mounting bracket. We went out to walmart and got the wiring harness for the M30. Well we read on the back that we need a special interface type thing for the bose speakers. Because there is an extra black plug coming out of the dash that the wiring harness does not have a connector for. Well we found what we need but not for the model car we have. We tried hooking the headdeck up without the black connector and the thing wouldnt even turn on. So as of right now my back seats are not even bolted on, my dash is apart, and i have no stereo. Can anyone help me?