This turn signal was pulled from the left rear of a 1979 CB750. It has been tested and it works. It is in really good shape for it's age. No cracks in the lens or housing.
The parts diagram shows two different part numbers for the left rear and right rear turn signals. However, on the wiring diagram, both left and right have the same color wires and there are no screw holes on the very top or bottom of the light. So, i am confident that this light could be used on the right rear as well.