I installed a set of Bosch H4 headlamps on the car, which consists of the housing (a glass lens and rear section with a spot for a modern type bulb), an H4 bulb, and a rubber gasket. They are more correct in the 928 than the old sealed beam type which were a DOT requirement in 1979. H4 bulbs have a more razor-sharp edge to them, like modern lamps, versus the diffused “illuminate everything” sealed beams.
