The 4 studs that hold the instrument bracket to the top yoke are longer for Ceriani yokes compared to Marzocchi yokes. So I had to remove all 4 studs and fit the correct ones. While doing it I noticed the new ignition switch now comes without the rubber boot protecting the connections on the back so I found and fitted one. To do this I had to remove the 4 pin connector block and refit after sliding the rubber boot into place.
During this session I managed to break a fingernail. I'm sure it will give me problems before it gets better.