A Coleman 242 fount uses the same size fitting for the valve and will work with a little adjustment, you'll need to push down the top of the 242 and reduce the height a little so everything sits properly. I did this using an end cap from a plumbing supplier that used the same fitting as the valve, two wood blocks and a G clamp, go easy it doesn't need much reduction in height. The fitting size escapes me, but I'm sure someone can chip in. HD
There's a chance you could find a steel fount, but as Tony said the best place to ask is the Coleman Collectors Forum. HD
Perhaps you could look on the lanterns which you already have as parts lanterns and then search for other examples of those models, it's an idea anyway.