The headlights are vital on your Chevelle especially when driving at night or in harsh weather conditions. It is possible over time that your head light assembly can become loose and you may have misplaced your adjusting screw. Each headlamp required an adjusting screw and nut to keep your headlight secure and adjusted for maximum visibility. Count on Eckler's Chevelle for all your 1971 1972 1973 1974 1975 1976 1977 Chevelle parts needs.