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Yeah you need the harness, unless you're an epic tight ass and want to do some wiring. It's just an adapter to convert the pre lci plug from the car to fit in the new lights. They're cheap and the 1 part number has both the left and right harnesses.
Then you need to 'code' disable the bulb checks. The new foot well module isn't really needed unless you have the real old module 2 and want to recode the software rather than remove bulb checks afaik.
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