Thank you John (thelews).
That is very interesting ! I'm glad you pursued the rocker color issue with Gernold.
I'll let a little time go by for additional posts, then I will make an adjustment in the Tech Manual.
John (49er), maybe you can take something you know is black and hold it up to the rocker and look at it and see if the rocker looks black, or blue, or grey.
Based on Gernold states, your car can certainly have black rockers.
Hopefully some more people with original rockers will join in and help us with the cutoff. ... Probably not too many of you out there. Certainly not me.
On the subject of a flat finish being "polished" over time to a semigloss or gloss, I have a Camaro with a flat black section in the rear. It was painted in 1977 or 1978.
The back is still completely flat. With no sign of glossing up. .... maybe I better go look at it to confirm ...
It has never been through a commercial car wash, at least since 1977. If a car were to go through a car wash, that rocker area can sure be subject to "rubbing" (I'm sure Michael will now chime in since I mentioned car washes).
My family would disown me if they new how interested I was in rocker panel colors from 40 years ago.