What is the correct color for 67-68 lower door vents

Well thank you for all the advice and help. I still have not found anything about the original colors?
I have to assume it is body color and I have to assume they made more black interiors than color.
I did it both ways black and red, black was very ugly.

I have the dye, the cleaners, the primers. I dyed the door panels on the car now red in 1990 or 1991 and they have held up great but I replaced them with brand new ones from legendary ...much nicer. I still wonder is this right? oh well they red now I will not live another 30 years to change them out again. And the little black flap is black, not painted red. I took the vents apart this time. And if anyone ask it took 6 months to get these panels from Legendary. Did not make it run any better or faster but looks a lot better doing it. This is actually a 340S clone with 3:55 posi and she will go go go much faster that I am smart but fun to step on it.

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