Thanks for the replies..
I restore/build cars for a living and this thing puzzles me.. If you look at the mounting brackets and the hardware, it looks 100% like a factory installation. Even the subharness to the third horn just piggybacks the original dual horns and definitely
looks factory.
The car is a near perfect original with an absolutely 100% original interior. This car drives unlike anything I have had at the shop in a long time. Actually feels quite a bit like my old 69 GP 428SJ 4 speed. I will never live down selling that car.
Perhaps a GM dealer accessory that was available in 67??
Mike