Yes, I have an original pair for my '28 Phaeton, which I bought from a Hemmings Motor News ad, about 1964. Generally they are referred to as 'Fold-Down' Windshield Stanchions. I think you may find an ad or two (I know that there were at least two manufacturers) in the book "Those Wonderful Unauthorized Accessories". One manufacturer made them of pressed steel, another of solid bronze or brass - not sure which. They have a slit on the inside for a rubber gasket. They were either nickle of chrome plated. Originals had a round knob with serrated edges - like the windshield swing-arm tightener knob of a closed car. Later reproductions had the less costly armed twist nut, as pictured in the shorter arm of the first photo.
The last I saw of the reproduction Fold-Down Stanchions for the 1928-'29, was about 15 or 20 years ago, carried / sold by Sacramento Vintage Ford, page 438 of their catalog #24-A .