
Now I do have the correct bottom yoke itself so what I'm really after is the tube that joins the yokes together (that runs through the headstock). The Aprilia bottom yoke I've got has a tube fitted to it that fits some Yamahahaha (don't ask!).
If you have such a tube and it comes attached to a Falco, Mille, Mille-R or Tuono bottom yoke (as it almost certainly will), that's fine.
Does anyone have one hanging around in their collection of spares that they would be happy to part with?