And Thing-a-Ma'bobs Accessories for the 1939 models show; Choice of antenna's. A skyway or a roadway antenna which is mounted to the underside of the running boards & looks like two sled runners. A clock in the rear view mirror. ----- Heat control switch on & off to maintain temp you desire. (Auto-temp 1 ? :) ----- Fresh air heater attachment to the heater. -- Hot water booster attached to the exhaust pipe to pre-heat water to the interior heater. ( What will they think of next? :) May be viewed on 39 pg. "Accessories".) That's All Folk's. Have a Happy Healthy New Year Jim