I was somewhat joking about buying a 4X5 Graphic, but since you have a 405 on the way, it may turn out to be what you need to do. If you are handy with tools, making an adapter to hang the 405 on your Century seems possible. However, any adapter will probably move the film plane back enough the rangefinder won't be accurate. If you plan to focus with the ground glass all the time, you might be able to live with this. I recall back in the 1960s there was a Graphic Polaroid back that predated pack film. It came with an adapter to move the focusing screen back the proper amount. Searching past posts over on Graflex.org http://www.graflex.org/helpboard/ind...498da1449a7d77 might uncover a solution I don't know about.