So I installed my new unit today, along with satellite radio, all of which works just fine and I love it. One problem though, the adapter that everyone says to get to use the stock amplifiers does NOT fit my car. This is the one I ordered:

FD03B
The plug doesn't fit anything that I disconnected from the stock stereo. So basically I have the stereo hooked up to the tweeters right now, since they are part of the stock harness.
I need to know what to do to be able to use the stock amps from this point, since obviously the adapter is out of the question.