The right taillight on my 58 had a couple wires sticking out the side that I figured were just tapped into the harness behind the socket and the edge of the lens/bezel was a convenient place to route them out.
I opened it up today and discovered this. The wires are routed *inside* the bulb and are connected to the two filaments.
Anyone ever seen that before? I feel like the bulb had to have been made at the factory like that, but maybe someone disassembled it, added jumpers, and put it back together?