I put the David Kirk muffler crutch on my 1250 Nightmare. After doing so, I used J.B. Weld to fix the aluminum frame that the exhaust box is mounted to,. It must work, because the repair is still holding as it was repaired, and there has been no further damage to either the aluminum frame or the muffler box itself.
David sells his Cub Cadet stuff as a week-end business, but he will contact you or send your parts as you ordered. He is a good guy, a great resource and has forgotten more about a Kohler k-series engine than I can ever attempt to know.
Good luck with your project.
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