Hey, if anyone out there has, or plans to have a 55-56 replica, there are some sunvisors on ebay right now. They need rechroming and maybe new plastic inserts. The plastic inserts are easy to get through NLA for about 40 bucks each, but the chrome metal pieces are almost impossible to find or get. Believe me if you want to do something like this you should probably go as much as 250 on these. I have 600 in mine and I don't think I could get another set but I would be willing to put you in contact with the person who can get the reproductions.
I had mine done in charcoal/black, but originals would have been brown.
Below is a picture of mine, but the ones on ebay are correct.