Until now I couldn´t find the right length for the spinnaker sleeve for the mizzenstaysail - I measured aprox. 14 meter from top of the mizzen to the fix point on drawings, so I think 13 meter should be right ?
While looking in the internet I found a nice address, showing and comparing Amel 54.
Yacht Design and Naval Architecture. Dublin, Ireland. Hydrostatics, Lines Plan, Yacht Surveys
No help for my question, but nice.