Vehicle headlight assembly comprising a housing having an opening, said housing having at least one lighting module (110) disposed within the housing, said lighting module (110) being sealed by a projection lens ( 118) arranged opposite the opening, said projector assembly comprising a sealing mask (260) sealing the opening between the housing and the lighting module (110), characterized in that the closure mask (260) ) comprises a rigid body (261) in which is formed an opening (262) traversed by the module (110) and an annular flexible membrane (263) disposed at the interface between the opening (262) and the lighting module (110); said membrane (263) sealing between the module (110) and the mask (260) while allowing the mobility of the module (110) in the housing.
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