2004 Rialta with an Onan generator. Encountered a truck tire tread which damaged the exhaust on the generator.
(Flex tubing on the exhaust - possibly stainless steel)
I would look in google or your search engine for Onan and Onan parts. I am sure you will locate what you need there as its not a Rialta or Winnebago par per se. Or a local smalll engine repair shop could help also.