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I have 2012 RX 350, which my best half ride over a brick flower bed today, damaging few plastic trim parts... I was able to identify all the parts I would need to replace with the exception of one. It locks the fender liner on the driver side, something like a bottom molding end, but is it not a mud guad, from what I can see..
Or ask a local body shop or Lexus dealer or even a wrecking yard - auto recycler that has some RXs if you want used parts. These would be in the pick & pull category.