They don't sell them anywhere. The ones in th catalogs are usually for the engines with side front mounts, or the back ones. The rectangular single in the 235 is rare. I bought one for a 261 off e-bay, but it has a different bolt configuration. I am thinking maybe I can drill it out. I do know there are places that will rebuild your existing one. Sometimes the guys that do dampers do these. Dale MFG did my damper and he did a great job. I saw them advertised in other old truck catalogs as well.
