Left.W/MATRIX BEAM. Right.W/MATRIX BEAM. A small valve, usually rubber or plastic in composition that allows moisture to vent from the Headlight housing. Headlight Bushing. Assembly cap. Assembly insert. Assembly screen. Bushing. Housing Vent Valve. spacer. Adapter seal. Breather. Filter element. Vent cover. Included with: Headlamp Assembly, Headlamp Assembly bracket.