exhaust hangers usuly survive quite long, just a thought here are your system fited like it should?, you dont want the hangers to pull the exhaust anywhere they should bassicly just hold the exhaust hanging in the right possition, i have done alot of exhaustwork and belive me i have cut down some old systems that have had the pipes straining against the hangers so hard that its been almost dangerous to be close to it when the pull from the hangers are relesed, either when cutting the pipes or hangers
anyway a good part# was the old IPC huth #1771 and walker has one #35957 not sure if that is the bulkpartnumber since where i work they are ordered in bulk but they are a pretty good hanger that works almost always as a mufflerhanger in front of the rearaxel on conventional exhaust systems, for the tailpipe hanger those works fairly well but not on all aplications since they are kind of long, not sure what car you have so hard to gues