You are not going to find a "ready made" bellows for your Korona. You will have to have a custom made bellows. Any of the popular bellows makers can craft one for you. Western Bellows in California, Camera Bellows in England, I think there is a Bellows maker closer to you on the East coast, by the name of Turner Bellows, although I am not sure they are still in business. You could do a google search. In every case, you would be required to send in your old bellows WITH attached bellows frames (front and back). They will use your old ruined bellows as a pattern to make the new bellows and mount it to your bellows frames. There was no standard to bellows design, each camera had a different size, or fold number, etc., and sometimes this changed over the life of the camera model.