Yes! Jefa has over 25 rudder blade molds, so we should be able to find a match for your boat.
Please see our ftp server if there already is designed a rudder for your boat.
Please see our rudder blades here.

Jefa can match the angle on your blade by useing inlays in the rudder blade mold. The rudder get shorter when using inlays

Jefa need a sketch of your rudder so we can make a production drawing. Ones there is made a drawing, you will make the approval.
It would be good if you also sent some pictures of your rudder (both stock and blade).

If the sealant is bad, then remove it, and give it a new sealant. Use Sikaflex 221 or 291. Pleas follow this guide. The sealant should be checked when possible.

Yes, that's something you should be worried about. You must check if there is power from autopilots or anything else. You can read more about the issue here: https://jefa.com/install/electro.htm