What was the make and model of the truck the Hillbillies drove???

Jethro referred to it as a "studs" in one
episode....I don't know what kind it is,
but when the movie came out, I remember
reading the truck for the movie was a replica
of the original, and that it was a 1932
model....someone else may prove me wrong,
but it seems this is right....

The truck was a 1921 Oldsmobile.