To all of those who may be concerned: I have found that Checker Auto Parts has parts for Chrysler from 1928 all the way up to current!I think in the midwest area they would be known as Shuck's or Kragen. I have just orederd a New master cylinder for my 1964 300K The total cost is $51.00 less $25.00 core. I thought that this was pretty reasonable. Phil