I think in that vintage you probably have a 6 volt system?
If so it will probably cost you a little mopre than the guys with the 12 volt setup.
I don't know of anyone who makes the motors that run directly off 6 volts.
I had to use a power converter in my '48 Cadi in order to update the wiper system to electric. A little more costly and a few more wires and gadgets to deal with.