'69-'70 INNER Grille Experts Needed,...

[lolife99]

I have the original complete inner and outer grille assembly out of my '70 stepside.
I also have a NOS inner grille that I ordered in the 90's for a '69 lwb truck that I had back then.
I took the NOS inner out of the box for the first time tonight.
It's actually a '70 inner grille painted black and silver from GM.
(more like a '69 grille)

My original '70 inner grille appears to be painted solid black,... with just the silver highlights on the raised rib sections of the grille.

So what is the "correct" way to paint a 1970 inner grille?
I'd like to use my NOS grille assembly since I have the outer grille also,... but I think I will need to repaint the inner grille.

Any help would be appreciated.