It is a very old number. If you do a search on Lawnsite “Exmark anti blowout baffles “ some threads should pop up with pictures and parts numbers. Let me know if you still can’t find the number and I will do some research.Would you happen to have a part number for this by chance? I was at the dealer today, and they, #1 Had no idea what I could possibly be talking about, and #2 Couldn't see anything in their computer parts diagrams.
I might be able to try another dealer or 2 in our area, but thought you might have the info close at hand.