I don't believe I have a Fulton visor and I think they attach differently. It's my understanding that the Fulton style visors are the ones with the adjustable bracket arms on the side, correct? I think mine is an original Chevrolet visor because it looks just like the one pictured on page 86 of the 1951 Chevy Accessories Installation Manual.

http://chevy.oldcarmanualproject.com/accessories/1951am/51aim86.htm

On the next page, and other places I've read, it mentions drilling into the drip rails.

http://chevy.oldcarmanualproject.com/accessories/1951am/51aim87.htm

But in any pictures I see with this style visor, there are brackets that attach the visor to the drip rails. I JUST came across this drawing on another forum that has some detail, but am still wondering if there's anything with any more detail/measurements?

http://talk.classicparts.com/attachment.php?attachmentid=5656&d=1277050262

Kienan

1951 3100 5 Window
In the Stovebolt Gallery
Lots more pix on Flickr