MikeC,

Here is the area of the diagram posted by '54 3600 that shows the "strap". Each end of the strap is bent to fit the diameter of the muffler. One end of the strap go through a slot in the hanger/bracket and the other end of the strap goes through eye/opening in the threaded bolt that tightens the strap against the muffler.

It is hard to explain, but the diagram should be a big help (thanks, '54 3600).