Exterior Sun Visor

[Boomerswany]

I've only seen few, anyone know of a source new or used..?

[Funky61]

They have some like that on EBay but I'm sure a local big auto swapmeet may have them. Fulton was a name that came up as far as manufacturer.
Look at this on eBay:

https://www.ebay.com/itm/302132128925

NOS FULTON ROOF MOUNT SUNVISOR CHEVY PONTIAC OLDS TRUCK V123