The white ones are definitely correct for 68-70 B bodies and were on every one of mine.
Those cars also used perforated clear-ish straps on the rt apron and over the shock tower on the left apron.
Basically, where there's a trough, the white ones pictured are used.
I'm fairly sure the same applied to A-bodies, but it's been a long time since I had an original/stock Duster.
I'm pretty sure the black ones arrived with the E-body and 71-up Bs.
My '63 & '64 both used the perforated straps on left apron, and the white pictured on the rt apron.
I seem to recall perforated style on their rad supports, too.
Body color played no part, nor did assembly plant; I've owned many different colors and from I think every assembly plant.