I cannot locate the post described in my headline, but there are a couple brackets for sale on eBay : https://www.ebay.com/itm/1937-40-Cadillac-LaSalle-LH-Sunvisor-Support-NOS-4074303/264596115635?epid=4029956754&hash=item3d9b2850b3:g:pc8AAOSw2XteGoMM
Carl,
Here's the post about the supports.
Many thanks Carl, I think I have now found the exact replacement I need. Ty Stinson