I wasn't able to find any doing a search but you can mount a standard third light that uses a bulb and put a 6v bulb in it. You can get 21cp out of an 1129 6v bulb. The 1129 uses the BA15S socket.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.