I don't, but I have improvised two. For my King Cleveland, I had a friend with a lathe make one out of wood. For another horn, I found a (real cork) champagne cork worked well. (There is some variation in size, so you may need to try more than one.)
Maybe it's a long shot but I picked up an old Buescher end plug from Ebay that was perfect for my horn. I had lost the original years ago. Wasn't even actively looking for it, just happened to pop up when I was looking at horns.
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