Registration and Posting Agreement
In 1980, the Chevrolet Silverado and the GMC Sierra Classic, both top-of-the-line trim levels for Chevy and GMC, came with the rectangular headlamps. All other trim levels that year for both Chevy and GMC had round headlamps. I assume it was done as a transition to the new '81 - 87 front end.My 1980 Custom Deluxe has the round headlights. I changed the headlamp bezels to the 1973-1978 style -- just a matter of personal taste.