I have my circular attachment - my early Christmas present to myself. It is different the the one for the 12000 and machines with that particular needle plate. It also has a stabilizer on it so it won't move like the old ones did so that sometimes the circle wasn't round. However, our Janome Educator told us to put a piece of tape on the others and then it would not move - don't why I didn't think of that.
I'm still waiting for my binder attachment - wish they would just sell me the bottom plate, but apparently Janome Canada isn't going to do that, so it will be the whole thing again. I do have lots of children and some do sew so the old one can be passed on.