While very similar, there's a chance a 1980 El Camino grill won't fit a 1979 perfectly. The styling changed slightly from year to year in that era, and although many parts are interchangeable, the grill is a component where subtle differences can cause incompatibility.
It's best to check with a parts supplier specializing in classic GM vehicles or compare photos of the grills side-by-side to confirm if the mounting points and overall shape are identical.
