I use to have Crown Graphic and never changed lenses. I now have a Toyo Field and trying to get a handle on lens board selection. I'm having a hard time finding them used, as well as new. The lens board I need is a flat 110mm square board for a 90mm lens. Which would be a No. 0, right? I'm looking at used Super Angulon f8 , Fujinon SW f8 or possibly a Rodenstock Grandagon N f6.8. I've seen them mounted in Seiko, Compur and Copal. Are all No. 0 mounts the same size? Confused about this. Also on the KEH site the lenses are listed with numbers such as a 35 mount. How does the 35 relate to No. 0? It seems more confusing than it probably is. Any help would be greatly appreciated. Thanks.