more roadster help needed

[gearheadbill]

Working on a 29 roadster and have another question.

There has to be some kind of doubler or nut plate that goes behind the A pillar where the windshield posts go that allow the post screws to thread into. What does it look like? I can certainly make something but it would be nice to have an idea what Henry did. Thank you.

I have attached a couple of pics of my reproduction body. A picture of what it's supposed to look like would be nice if anyone has one.