I bought a 1997 stock stereo and amplifier for my used 1993.5 Supra. Turns out the previous owner must of had a non stock stereo and amplifier (but decided to remove it before he sold it to me!), anyway, my problem is I see only 2 connectors under my passanger seat that would fit perfectly in the new stock amplifier. BUT! the amplifier has a third white connector left , and I cannot find a third connector(harness) under the seat. Is there something I'm not seeing?. My other problem is I saw a small looking amplifier behind my old stock stereo that is connected directly to my old stock stereo. Will I need to use this old amp again?,. can I connect the new stereo without using the old amplifier?. Please help me!!!