Now you got me curious so I looked it up and according to
THIS WEBSITE Waldorf White for grille bars is PPG 246-7105 and DuPont 93-7105
This is the first time I've found this information and don't know why an automotive paint store couldn't mix those codes. I'll be down there this week and will take the codes with me to see if they can mix it.
Color is always a hot topic here and I'm glad you brought this up.