Well if its the factory plug you can either do one of three things, splice into the wires, cut the plug off or get speaker plug harnesses. First locate the positive terminals on your new speakers. And if your wire colours are the same at the speaker as they are in the dash here is the colours:

Right Rear + = Pink
Right Rear - = Blue / Yellow
Left Rear + = Blue / White
Left Rear - = Blue / Black

Hope that helps

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