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I have the light gray interior and replaced the light gray mats with std black ones. Excellent look (i.e. not distracting) when you are all nestled in your seat. Not quite the right look when getting in or out. Darker gray mats would be much better.
I don't think black on cashmere would work at all. Have the Lexus parts guy take a black mat out and try in your car before buying - they should at least do that for you.
I have the same color combo and tried the black mats, didnt look good at all, I ordered the premium floor mats in Cashmere alot better mat, I am going to put the ones that came with the car in for the winter and switch them come spring.