The 1939 tail lights also used the double filament 1154 lamps. The only difference between the tail lights is the length of the wire, the panels used a longer pig tail. No matter what, the tail lights are interchangeable with the wagons and the panels/suburbans.
http://chevy.tocmp.com/chevyresto/3962.htmChevrolet http://www.donsbulbs.com/cgi-bin/r/b.pl/1154~usa.html
1939-COACH REAR-LAMP Automobile
1939-COACH STOP-LAMP Automobile
1939-SEDAN REAR-LAMP Automobile
1939-SEDAN STOP-LAMP Automobile