I am trying to find a replacement for the nylon bushing /gasket that sits onve the rudder post inside the cockpit of my 1984 Catalina 30. I have wheel sterring. The rudder post enters the back of the cockpit. There is a metal cap on top that is for the emergency tiller. below that is a Nylon bushing. Mine is quite worn. The OD of the post is 6cm. The thickness of the bushing is about 5mm. Can any one tell me where to get a replacement??