Sorry I didn’t thank you sooner, I have been on the road all day. I really appreciate it!If you want to use the original round pot style muffler then you need a short piece of 1 inch pipe with a slight bend. You could really probably bend one yourself from about a 3 or 4 inch pipe nipple. The correct Kohler part number is KH-235194. I bought one about 15 years ago, but they are now listed as NLA new. You could tell all it was is a piece of bent pipe, and honestly it wasn't all that well bent. You might be able to find one NOS or used if you look around. I'll try to remember to get a picture tomorrow of the correct setup, but this is what someone had rigged up on my 100 before I changed it. If anything this cobbled deal had too much bend to it.
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You can get a lock from most any plumbing shop, Home Depot, AceHere are the pictures I forgot to get yesterday. I didn't have a lock ring on this one, although I do typically put one on. It fit so tight that I didn't bother and it's been fine for 15 years. Anyway the pipe was between 4 and 4.5 inches long before it was bent.