grille colour of the 1970 Challenger R/T

I just started to work on a 1970 Challenger R/T, the car is a survivor, no rust and very original as far as I can see.
But one thing I don`t understand. The grille surounding and the headlight bezels on this car are silver or just polished. Not black or grey as they were on the R/Ts as you can read in all the e-body books. Does anybody know if it is possible that this is original, was it maybe a orderoption? I have seen some R/Ts on the internet that look exactly the same, but I donĀ“t know if they are original. Maybe on my car somebody changed all the parts a long time ago.
I attach a picture of the car and I am thankfull for every information. The car is a factory R/T, I have the fender tags. Thx
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Author: joehiggins