The phrase "custom headlights" refers to headlights that have been altered or modified to be unique and different from regular headlights. Full definition
Replace or upgrade your Honda Civic Euro Headlights with our Honda Civic 1996 - 1998 Smoked Custom Headlights. (topgearautosport.com)
Up front gets a DeBerti billet grille and Bullseye Retro custom headlights. (automobilemag.com)
The Elantra Sport's exterior gets custom headlights, AutoArt body and paint work, a custom Aerotek front, side, and rear aero kit, an APR GTC - 200 GT wing, and the extremely bright BASF Glasurit Arancio Borealis (read: orange) paint job you see above. (automobilemag.com)