As far as the key lock I think 41 and later had key lock below door handle not in the door handle. That is how mine was. But I have read that 1941 can also have the key in the door handle so maybe they switched mid year but your 39 should have it in the handle on the passenger side. All of them were passenger side exterior lock only with a little interior knob at the rear of the driver's door. I asked about this once before and someone told me that everyone exited the passenger side in the city (where you actually used locks) because the streets were so narrow. Sounds good anyway.
