I have three helmets I will be working on in the near future. I plan on using the brad tee nut method for installation of the visors....BUT, does anyone know offhand a quality visor that could be ordered online, say from amazon or ebay? I don't know the thickness desired, but I definitely don't want one of those paper thin film visors. And smoke grey is the color of choice. What shade do you recommend? better to go with a 4 or go all the way to the 5 shade? Any help with a good brand/model is greatly appreciated.