I'm also trying to decide on which color weathertech mats to purchase. Sorry, I can't help you on the floor color for a hazelnut interior. I have an espresso colored floor w/ sand seats. I think the black might look better than the tan.
I have Hazelnut (Reserve pkg) and the floor carpet is definitely black (as well as the headliner and A/B pillars). The factory floor mats are black as well.
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