Black Baking Dulux is the color called out for them. A side note is that my salesman order books (1949 & 1950) have a provision for 2-tone or fleet color requests routed to the zone office. What that would mean is nearly anything was possible if requested through the proper channels.
https://www.flickr.com/photos/advance-design_parts_co/43741368201/in/album-72157631872034068/
https://www.flickr.com/photos/advance-design_parts_co/8335509814/in/album-72157631872034068/