This metal recessed lens board is about 101 mm square. The lip that fits in the front standard is a little over 4 mm deep. The hole for the lens has a 35 mm diameter. The recess is about 1.25 inches deep. See the pictures with the ruler. The picture of the recessed depth shows less than 1-1/4 inch because the zero point for the ruler is offset from the edge. I’ve included a picture of the ruler to show that. As one of the picture shows, there is a mark on one side of the recessed part. That should be inside your bellows. I bought it for my Calumet CC-401, but it’s a little too big for that camera. I’m not sure what it fits. It was advertised as working with Calumet cameras, and I have heard that the lens boards for newer Calumet cameras than mine are a different size. So, it may fit one of those. But, I don’t have one to measure so I can’t guarantee that.I am adding .00 to ship this UPS ground. (Louisville is a hub, and I think UPS’s tracking is better than USPS.) That’s good for the lower 48 states. I’ll ship to Alaska, Hawaii, or overseas at my actual cost.