Hello, I wonder if Foss has an option on those also.
We replaced our 2001 460s original fiberglass posted rudder with a stainless posted rudder back in 2005.
The diameter of the steel and glass post are quite different. Glass being larger. So space needed to be absorbed when putting in the steel posted rudder. Foss achieved some of it through a stainless shin round the post (welded on permanently—or lathed? Not sure how). But part of the post.
The rest of the space absorbed by larger diameter bushings. Seemed to be of nylon.
The fun part of the job was using dry ice to shrink the old and new bushings to remove/insert them.
Difficult part was digging a very deep hole (the post is quite long as it goes all the way up to just below deck) contrary to cable driven quadrants that are shorter below deck. Had to rent an electric jack hammer, get yard permission, and dug it more as a slit trench. Also getting the quadrant off top of glass post resulted in our obtaining a new quadrant (drag link type) because heat and hammering it made it quite unsightly.
Hunter provided quadrant and bushings. There was uncertainty on what needed to be the inner diameter of the new bushings. The question was if we were going to operate in cold water or tropic water? The tolerance between the steel shaft and ID of the bushing had to be greater (a larger gap when new) to allow expansion of the nylon in warm water.
I know some of this is off your question, but you know how one thing can lead to the next.
One other thing I found with the new rudder was that the hole for the quadrant bolt had to be drilled. The reference must come from the old rudder if you want your emergency tiller to work as it should since it slots on that bolt.
All the best, Tim