I replaced the one on my Dodge 440 with one from a salvage yard as Chrysler no longer makes these. After several months, the replacement was bad also (rubber gives away). Found a place that rebuilds them properly for a decent price. He is:
Damper Doc
1055 Parkvies Ave Ave.
Redding CA.
877-834-2137
DamperDoc@aol.com (//images/smiles/icon_smile.gif)