The extra wire is probably for intermittent wipers. You may be able to fashion a harness to make it work. From what I see in the FSM the green wire is for your low speed and should go to terminal 2 on the plug, the red wire is for high speed and should go to term 3 and the black wire is to park the wipers and should go to terminal one. This should leave a blue wire as the extra. I took a look at the extra wiper motor I have and it has those same four wires and NO PLUG on it at all. You should be able to use the old plug if you happen to still have it.
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