A headlamp assembly comprises an optical unit adjustable mounted within an outer shell (24), which may in some cases be part of the vehicle bodywork. The optical unit comprises a reflector (10), a lens (not shown) permanently bonded to the front of the reflector, a main lamp (20), and a side-light bulb (54) in a lamp-holder (14). The rear of the outer shell (24) is closed by a one-piece seal (30) molded in an elastomer, which seal has a central portion (34) which lies against the rear of the reflector (10), to seal off the space between the shell and the reflector from the electrical connections to the lamps (20, 54). The side-light holder (14) is mounted from the rear in a passage (50) in a thickened portion (48) of the seal (30). The central portion (34) of the seal is connected to the portion (32) connecting the seal to the shell (24) by a flexible re-entrant sleeve or bellows portion (36, 38), which accommodates adjusting movements of the optical unit.
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