Karl is trying to tell you that the picture you sent is a header for a 610/820, not for a 580/700, as you are looking for. I make gaskets and have a file for that flange. I can send it in dxf or pdf if you want to have someone cut one for you....or you could make a pattern...or I could make you a pattern from plexiglass that will trace well! Let me know if I can help you!