I always thought it was red.
Meant for the other one I still need to finish
Tvisor.com sells them. I bought one from them and it is dark grey.
Also, if you order goods from FP, you can ask him to throw in a Tvisor for you. Saved me from making even more separate orders.
You can always go to a local wal mart or store that sells car/truck mods and get some window tint to put on a clear visor. I got a huge roll for about $5 to make my clone helmet visors. You can get any shade to the point of it being a light grey color and put it on a clear face shield. All you need is water and to apply it.