5366. Controller gasket. Left.2018-21. Right.2018-21. W/MULTI BEAM. A seal that prevents oil from leaking out, or contaminants from entering the Headlamp Control Module. Headlight Control Module Gasket. Headlight Gasket. Part serviced with Headlamp assembly. seal. Actuator. Computer. High Intensity Discharge (HID) O - Ring. Ler. Included with: Control assembly and Headlamp assembly, Headlamp, Headlamp Module, Headlamp Part cannot be reused/reinstalled, Headlamp assembly, Headlamp assembly Computer, Headlamp assembly Headlamp Module, Headlamp assembly Module, Headlamp assembly Part also included with Computer, Headlamp assembly Part also included with Control Module Part cannot be reused/reinstalled, Headlamp assembly Part cannot be reused/reinstalled, Headlamp assembly Part is not reuseable, replace only, Headlamp assembly and Module, Lens & housing, Module, Module Part cannot be reused/reinstalled, Part cannot be reused/reinstalled Headlamp assembly Part also included with Computer, Part cannot be ruesed/reinstalled Headlamp assembly Part also included with Computer, Part is not reuseable, replace only Headlamp assembly Part also included with Computer.