So, has anyone ever seen one of these before???...

It was an extra cost option. See the pages at http://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1969/69_Barracuda0011.jpg

& http://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1969/69_Barracuda0021.jpg