Sharktooth grill and 3d print. I had a thought.....
Yes get me dimensions and I can make something for you
Or if you have a small section of grill from a broken grill that would be better.
My bet is that Chrysler used some sort of mask (adhesive decal???) to mask off the area to NOT be painted.
I have seen where there is slight overspray on areas that would not be painted, so maybe they had a spray gun that was computer (they had them back then) controlled and would start stop in a pattern while the the part moved under it?
OR maybe a screen print os some kind????