The Chevrolet Bel Air had two taillights per side well into the last years it was made, in both the USA(1975) and Canada(1982).

BTW, I'm the one who posted the message about Chevrolet Truck I.D. #'s of the 1940's & 1950's. If you'd like to merge the two messages, I'll be happy to post any other tidbits on Chevrolet cars and trucks in the thread.