Hi, This unit was > removed from a 55 Imperial, And I know 56 units look the same..but they > also used a bellows type that looks totally different..however ether one > can be used..thanks Mike "Motors" manual says this type unit was fitted to 1955-1961 Chryslers. The Powervac unit was manufactured by Bendix. Under the Powervac type, there is an elliptical vacuum chamber unit shown also. The Powervac unit requires reactionary shaft linkage. I do not see how it would retrofit where a K-H unit was original. There is also an elliptical BELLOWS K-H unit shown. This would be used with reactionary linkage also. Our 1958 N-Y had this type unit. The Powervac units are of piston design as shown in "Motors". K-H units are bellows or diaphragm. Anyway, it seems to me that the eBay REACTIONARY LINKAGE part is not a direct interchange for K-H diaphragm PUSH THROUGH units. I would imagine that the Bendix unit on eBay is kind of rare? Fits Imperials? My C300 has an Andy Birnbaum retrofit power brake unit. This I did so I could have brakes. Parts to build my 1955 unit as I once was able to do were no longer available. I do not know what the original application was for the ordinary looking A-B kit parts but they do work quite well. Warren Anderson Sedona,AZ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/