Does the ends of the hood where the black air grabber insert end get painted black ( if so what texture) on Road Runners AND GTX s in 71?

Or is it a model thing? I have seen it done on both, but not sure if this is due to an incorrectly restored vehicle or it was done from the factory this way.

Also, what color were louvers if they were so equipped? Were they always body colored ? Or only available with vinyl top, and always black?