The Graphic View series used the same lens board that many other press and view cameras of that time also used. They should still be plentiful. They are also easy to build up with two square pieces of properly sized 1/8 inch plywood or other material. The front piece is 4" square. The back piece is 3.5" square. Since the back piece is merely a light trap, it can be made of foam core, foam rubber, thick felt, or almost any other blackened material. If you have the tools to cut the hole for mounting the lens, fabricating the board should be no great problem.