I used these sealing caps when replacing actively cooled (fan) LED low beam headlights because the bulb assembly is large and protrudes from the headlamp assembly preventing the original headlamp end caps from being installed. Simply slide it into the headlight assembly until the correct rubber rim snaps into place. Basically, until the rubber boot goes on. Make sure there are no wires in the headlight assembly; only the back of the lamp body emerges from the central hole.
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