I would agree that it will be a long shot. I looked for outside jaws for a 5" Union chuck for over 10 years before I finally gave up. In that time, I think I looked at several thousand sets of jaws at a dozen or more used equipment dealers. I was able to find an almost identical chuck with the outside jaws for less money than it would have cost to make a set. The jaws don't interchange from chuck to chuck, so I have to change chucks when going from outside jaws to inside jaws.