Up for Buy-It-Now is a new old replacement stock muffler clamp with an after market part number of 6645.  This item was obtained from an old service garage and is not a newly remanufactured part.  According to the box and my vintage exhaust manuals, this is used on the following models and years:

Chrysler...All 8 cylinder Dual (factory equipped) (2 used) (outlet)..8 cylinder 1954-1956
Chrysler...6 cylinder (outlet) 1936-1954

DeSoto..All Dual(Factory equipped) (2 used) (outlet)..1955-1956
DeSoto..All 6 cylinder (outlet)..1936-1954

Dodge..All (8 cylinder Dual factory equipment) (2 used) (outlet)..1955-1956
Dodge...All 6 cylinder (outlet)1936-1956

Plymouth..All 8 cylinder Dual (factory equipped) (2 used)...1955-1956
Plymouth...All 6 cylinder (outlet), All models (inlet)...1942-1956

  The clamp package is in brand new, never used condition and is free of any damage.  The clamp itself has some spots of extremely minor surface rust from many years of shelf storage. May or may not need a light polishing up before installation.  The original box is in good condition.
  Please feel free to E-mail me questions.  International bidders are always welcome.  Thanks for looking!!!