2018-21. 5366. Ballast screw. Left.LED. Right.LED. A screw that is used to secure the High Intensity Light Ballast to its mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Headlamp Control Module to a mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the High Intensity Light Ballast to a mounting point.