Just a heads up, I just replaced the blown out, broken down muffler on my Closed Side LGT 165.
I was looking for a bolt in replacment, but was having problems finding one.
New Holland still sold them, but wanted an arm and a leg for it ($176)
Tried looking Nelson Mufflers up to see about getting a muffler through them, not able.
Finally started going through the Walker Catalog, Under their tractor section I had found a muffler close to the specs of the factory muffler (6" in dia and 12 1/2" long, with a offset inlet and outlet.
Ordered the muffler up and found out that it is a direct bolt up muffler for our closed side units.
The Part number is Walker 22020, my cost through a jobber store was around $60.