It depends.
The shutter determines the opening size. Different shutters require different size holes.
If the shutter is a newer, standarized Copal, then the hole sizes are easy to find. There are 3 sizes: 0, 1 & 3. GOOGLE knows.
Other, older shutters are different.
The above applies to ALL view camera lens in shutter assemblies. Rodenstock is not unique in that regard. I own a Nikkor lens in Copal #1 and a Fujinon lens in a Copal #0. My Kodak lens is in a Kodak shutter. Fortunately, it is the same size as a Copal #0. That isn't always the case.