Need rear seats for 1938 oldsmobile

Building a 1938 Oldsmobile street rod. Car do not have any rear seats, do anyone know what late model rear seat will fit with the least amount of modifications.

I cannot give you a specific answer, but I do know that a number of builders have successfully used the middle seats from vans as they are more narrow and fit older vehicles. I would take a measurement and begin checking out salvage yards.