Hey WC: Doesn't Univair and Skyport stock them anymore? PN 415-40167 are special clamps made with a tit to go through the hole in the muffler and pipe to keep them from turning. They need to be only tightened enough to hold everything in position. If you tighten them too much it is possible that the vibration of the motor will crack the pipe or the muffler. Lynn Nelsen
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