Wanted — Running board antenna for 1936 Pierce-Arrow.
There is a lady that sells radio parts on ebay, she lives in Iowa, Her father and his brother had a radio shop they closed in the 60s after 40 years of operation. She has ALL their stuff and is selling it.
I bought NOS radio adapter kit for my 1940 Lasalle from her and a preset plate for a console radio.
She is your best bet on anything radio related.