John,
There was no factory-option turn signals in 1950, but there were GM accessory turn-signal switches/lamps (very rare).
Parts vendors sell right rear lamps and hangers.
Some vendors sell turn-signal switches (look in "Links"). The can be used with 6v or 12v bulbs.
what have members done for dash indicators for turn signals?
Also, FAM shows a ignition switch bulb in the igniton bracket,but that is behind the dash,what does it light ?