Rudder bearing dimensions of the Hanse 411/2005

I don't understand that you have a rubber gaitor, because with self-aligning bearing, the tube is kept so tall that there would be no need for a rubber gaitor. The maintenance of a self-aligning bearing is also to pour fresh-water into the tube if the boat is to be stored on shore.

So the rubber gaitor indicate an old bearing house, but jefa has a pdf with spares with the self-aligning bearings - even with different measurements...

To be sure I think you would need to measure the diameter of the tube in which the lower rudder-bearing resides.

Either from the seaside or by removing the rubber gaitor.

Perhaps any 411 also from 2005 could help here?

I think my knowledge is not sufficient.

Kind Regards