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[BabylonDown]

No you actually wont. You can take the original 4" speaker box, take all the screws out so it comes into two pieces and pull the factory wiring out. That will plug into most aftermarket speakers. One side goes to the factory plug in the door and the other side will go to your speaker. I did this along with another guy on here, let me find his thread on it. He had a few pictures with it as well.

EDIT: http://www.supramania.com/forums/showthread.php?190943-Diamond-Audio-D364.5-Install

Alright. I'll have to go to the car and take a look at the plug your mentioning. Been nearly two years since I worked on the Supra, but I'm determined to get it done this spring.