Well, now, this is disconcerting.
My (original, AFAIK) driver's side scoop has no witness line - may've been sanded down, may've never been there.
The passenger-side scoop (replacement from Branda) has the witness line. The (original, pre-accident) pass scoop _also_ has a witness line (and a nice crack in it - don't know why I keep it hanging on the garage wall).
So now I've got mismatched scoops - bummer.
However, we now know that the Branda scoops are accurate repros.
Tom