I've gone from a Wingless sedan to a stock WRX wing. I want to connect the 3rd brake light on the wing and disconnect the third brake light in the cabin. Do I need a different harness or are the wires tucked away somewhere. I found the plug that runs up to the bulb inside the stock in cabin light, but it's a different size and shape from the wire hanging out of the trunk. I'm not sure if I received all the required wires from the seller, so if someone can let me know what to look for, I can see what all is actually there. Thanks in advance.

If all else fails run a positive feed off of one of the tail lights? I have a wagon though so i wont be much help with a harness