I received some more info from Du-Ha today:
"I did some research with the engineer and what we know for the 2017 Honda Ridgeline is that the part that we have up to 2014 will fit. We haven’t seen the colors yet (gray or tan) but he did confirm that the black would be ok. If you want to order, the part number you would need is a #50074.
I told them my grey interior was pretty light and she said theirs was a medium grey, which would be fine with me, it would give a little contrast to break the solid light grey up. I might give one a try.