passenger muffler hanger bracket

I have a "A" body and a "B". I added the bracket to the "B" body (66 Coronet) and found it on Ebay. This info is really based on my "B" body experience: the bracket bolts on with lag bolts...even a "factory installed" bracket. In my case, the floor had "drill point" dents marking the correct locations and used by factory workers when adding the bracket on the assembly line. The lags were installed from behind the back seat. My opinion/belief, is that all dual exhaust Mopars of this vintage were done this way.

I hope this helps you