A mounting assembly includes first long and short legs on a first light bulb holder to correspond to first long and short recesses in the first socket, a first sectorial periphery in an outer periphery of the first light bulb holder to correspond to the first arcuate periphery on the first socket and a first right angle on the first light bulb holder to correspond to the first angle on the first socket. Further provisions are second long and short legs on a second light bulb holder to correspond to second long and short recesses in the second socket, a second sectorial periphery in an outer periphery of the second light bulb holder to correspond to the second arcuate periphery on the second socket and a first right angle on the second light bulb holder to correspond to the second angle on the second socket.