Originally Posted by Diaric
Yup, them is round. 79 and older still IIRC. 80 was when things started changing I
but there were lots of options depending on trim packages, you could get the headlights either way. 79 and 80 use a different grille mounting then the others too.
Round headlights were 73-80 but in 1980 only the Silverado and Sierra Classic got the square lights. 1980 custom deluxe, scottsdale, sierra etc etc got round lights.