This is 165 by 100 mm rectangle headlights used for the USA market ranging from 1978-83 Ford Fairmont to the current generation Chevrolet Express. They are standard from the Federal Motor Vehicle Safety Standard 108.

https://en.wikipedia.org/wiki/Headlamp#Headlamp_styling_in_the_United_States.2C_1- 940.E2.80.931983