Totally different systems
The O'Day 27 has a rudder post that passes through the bottom of the cockpit, near the stern. The 272 model hangs off the stern with gungeons and pintles.Check with D&R Marine (see link on this web site). I don't remember their web site listing any rudder parts, but Rudy may be able to give you more guidance.If you don't find a replacement, I hope to haul my boat in about a month and can draw you the outline (and take pictures)so you can have one made. Perhaps there is a northern owner who has their boats out of the water now and can do this for you.You can find my email in the Owner's listing on this web site.Good luck,Jim Cook