Foss Foam has built every rudder for almost every boat made West of the Miss. The one we ended up using is from a Ericson 38, not that it matters, we were only concerned with size and shape. When the new rudder was out of the mold the top was cut to fit the curve of the hull, and the bottom cut parallel with the water. We put the rudder back in with the boat in the water. Along the way I rebuilt the steering box,built new cables, and added core and mat to reinforce the wheel area.
Iwould have the new rudder built on the old shaft and add a thicker insert.
This is located just above the upper spreaders. On the deck I used a tackfitting from ABI,mounted on the fordeck about 5' back from the stem. A turnbuckle runs from the backing plate to a spot on the hull that is in line with the direction of the load. It is important that no load is transmitted to the deck. The stay is stored along the port side lowers until needed.