I got a letter from Phil Remington (Shelby's Trans Am race guy) that in '68, they put rear spoilers on their racing coupes--claiming the GT/CS as the "legal" reason to do so.
The racing "referees" said "no", and overnight, they put the stock trunklids (and end caps) on the cars.
Since the Mustang racing team "had" to use the Ford engines, they kept blowing them up (and not winning), so they decided to harass the Javelin team with this spoiler stuff--since they got to have spoilers on their cars.
Terlingua? That's where they have chili cookoffs....and that sticker with the bunny with a sword. Somewhere in...uh...Texas? LOL
Paul N.