Doug you have listed two different brands. There are quite a few of this design made by different companies in Europe, and they are not all interchangeable, so be careful. I'll have to dig mine out, it's a different brand again, I'll try to get some dimensions, and maye a pic or two The two flanges are actually on a helix and work like a cam, You would have to make them out of some pretty tough steel because they are hardened, A piece of axle steel would be good.
Send me a pic of yours so I can see what is missing, also note what the threads are, because I reckon I can get spares of some of the parts, if they are the same as mine.