I know the inlet where it slides on the exhaust manifold is 3 7/16" or 3 1/2". Do you want one that looks similar or exact original? The original should have two welded rings around the center of the muffler. If you can"t find an original I found one in the A&I parts book listed under an 1100 Massey diesel. I"m not sure if its a Nelson or Stanley. We put it on our 990 and it looks and sounds good. If you want that part# send me an email. For some reason the site won"t upload my photos, I can email them too if you want. John
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