That would be the last two years 1958 and 1959. The cars are referred to as "Packardbakers", due to the "marriage" of Studebaker cars and Packard nameplates.
Very good studebakers. Not so good Packards.
I have an obscure Corvette question?
When the Corvette debuted at the 1952 Autorama Show, What was the main visual difference in the show car, and the car that made it to the show room?
Unfortunately, I suck at posting pics, so I can't make it easy for you.