My replacement rudder was made by Idasailor. They made it from scratch. When I pulled OPTION and before I removed the old rudder, I was required to photograph the old rudder from all angles. Then, I removed the old rudder and shipped it and the photos to Idasailor.
The new rudder had all the the angles right so that its relationship to the hull was exactly the same. Idasailor did a fantastic job. Also, the send progress report photos.
Also, I opted to stay with the steel post rudder instead of going the composite route. This I did due to not wanting to change OPTION's phrf and due to the higher cost of composites.