Hi Randy, nice to see you again.Kevin is right. I had to change mine last year. I called to request the part and they sent me a gasket. I relayed to them exactly where the part needed to go. It turned out I needed only the donut mentioned above. The gasket they sent was for each side of the exhaust diverter. There was not gasket needed for the exhaust flange, just that donut. I kept the gasket anyway just in case I need it later. Just shows even the guys who work on these machines day in and day out make mistakes occasionally.
Thank you Kevin, strange why I can not find it at owners manual.