Chevrolet did for sure offer a spotlite for the full size models in 1961, I have seen several over the years but I did not think they were cable operated, they mounted at the rear of the front fender and had a long shaft with a handle on the inside. I would suspect that if it were ordered at the time the car was ordered it would have been installed by the factory, otherwize the dealer would have installed it. BTW, they were kinda square with a mirror on the backside.