Hey lassenc,
On that referenced page they said the headlight visor was intended for a 6" light. I believe you would have to change the radius/diameter size for it to fit properly. That is no biggie to do, but then you have to fab an attachment method.
I built a visor for my headlight, rolling, contouring and trimming to the shape I wanted. Made out of low carbon steel. The only trick thing was the attachment. I made a bracket that is welded to the visor. The bracket had to be "joggled", with steps in it kind of like this __/ with another horizontal bend on the top (can't do it with my keyboard). After welding, I drilled and tapped a metric thread through that new bracket for the headlight screws to pick up on and anchor it in position. Then, it was chromed to look like new. Far be it for me to lecture, just remember, that if you buy a new one of any kind remember to solve an attachment method.
Just my 2 cents............

~ ~ ~ jaknight ~ ~ ~