Quoting: Incursus
Seperate, side lights are in the mainbeam housing. though the indicator bulbs apear to be duel filament.
yup, they are 12 / 21 watt
the 12w is the origional (amber) side light, and 21 is the indicator
interestingly, there is a black box on the jap spec cars that turns the side light off while the indicator is flashing, so instead of flashing bright dim bright dim, it flashes bright off bright off, then the side light comes back on a couple of seconds after the indicator is switched off