These days it is very important to advise any shop that the item needing attention (the automatic transmission in this case) is interchangeable with some more popular (Ford, Oldsmobile, DeSoto, etc) make. In the case of transmissions, the Kaiser Hydra-Matic is the same as a Pontiac, Cadillac or Oldsmobile of same series. Series is determined by the prefix code on the tranny. The alphabet character identifies a unit built to fill a customer order (K for Kaiser, L for Lincoln, P for Pontiac, etc) and the number (-50, -51, -52, etc) identifies the "model year" of the unit. That part is important as there were design changes from year to year. Parts, service manual, etc are identical. Only differences may be in how the box is mounted and linkage from the box to the column shift.