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Which engine was in it and which engine is in it now? Which O2 sensor? There can be up to 4 of them. If a v6 or v8 there could be an O2 sensor on each side and also one before and one after the catalytic converter.
Now about the cruise control, are you speaking about the cruise control buttons or whatever inside the vehicle and if so is this on the steering column or steering wheel? If under the hood, let me know the location of what you want the wires for.