pre-porkpie rear lights function

[Rick F]

Looking at the "little" barrel-shaped rear lights and pre-1930 wiring diagrams, some appear to be twin filament but I presume with no brake light function.

Do people convert these for modern brake light use... and if so, how?

I have them on my '29 Special. More years ago than I can remember I obtained a pair of nice brass twin filament/offset pin bulb holders and fitted them in the base plates - I cannot remember where they came from, but it was probably a good old-fashioned "proper" scrap-yard. The installation was straightforward and the brake light runs via the conventional later switch (Seven Workshop) attached to the brake adjuster rod.

Initially I ran the car with conventional filament lamps, but have since converted to LEDs. The lamps have the original small lenses, but with the LEDs behind them show up well.