Hello,
I have what I believe is an original 1951 visor, but I'm not too sure. It appears to be the same as the one shown in the 1951 Chevy accessories manual. I took it off a 52 before I sold it, where it was attached directly to the cab. I'd prefer to attach it to the drip rails how it's supposed to be, but I can't find any brackets for it. Are these brackets available anywhere, or are there drawings/dimensions for them, or will it just be a matter of making something that will work. Here are some pictures of the visor.

https://flickr.com/photos/133232360@N02/sets/72157652521770110