There is a member on Impala.net who has a '60 Impala with the Ignition Switch on the Left Side. Never mind see one, I've never heard of one. States the car is US Made and the Dash sure looks factory.

The original owner may have had it switched to the left due to loss of right arm or hand,
Where is the light switch located?

On the left are three, Ignition, Lights, Wipers.

Check out how factory it looks.

Here is the thread, picture included.

https://www.impalas.net/threads/que...s-it-on-the-left-side.42372/#post-240685