NOS / New Old Stock Buick Factory engineered ...part number 1336725.  I believe this will be correct for many 1948-1960 Buick cars equipped with Dynaflow transmission.  It is in excellent condition with minor shelf wear.  You can't go wrong with original NOS parts....they were engineered to fit!  Nice addition to any car.  

Payment due within 3 days.  Buyer pays shipping.