3rd Brake Lamp (CHMSL)

I've been wanting to add a 3rd Brake Lamp (CHMSL) to my Dart GT for the obvious safety reasons. I'd like to find something that is sleek and unobtrusive. I stumbled across a picture of a Dart with exactly what I was thinking of:

1-CHMSL.jpeg

Does this Dart belong to a FABO member? Anyone have any details about the 3rd Brake Lamp (CHMSL) pictured?