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I recently took the front bumper off my 2013 JCW so I know the bumpers are not the same, but this part here looks to be that little deflector right in front of the wheel. They're attached to the bumper cover via pushpin fasteners, there's 4 or so of them. You can probably order through your dealer or use the part number to find it online at ECSTuning https://www.ecstuning.com/Search/Sit...h/51117250780/
So I think the broken sections are part of the front spoiler & these 2 lips attach to that. I think 3lusive is talking about the same thing. OEM part number 51117248788
Perhaps you're right, it might be an integrated part of the front bumper then. that part number you listed is for that whole plastic piece. If that is the part then I think the only way to get a new one is to get a whole new front spoiler which I'm not sure is worth it. I would bet it's $100+