What color were these items originally with a white interior ? For that matter, did the rubber and plastic plugs in the doors match the interior paint on the doors in all colors, or were they just black in some or all colors ? I am thinking the lock buttons matched the paint in most colors, but I think some may have just been black.

They're blue on blue, in my 6bbl car.

I thought the knobs and window vent adjustment plugs always match the upper door color (can be different that seats, carpet, etc).

Upper door color is on most fender tags (if not all?).

White, plugs and door lock.