Second Generation Barracuda Year to Year Differences

I'm curious if they put them on any of the 383 S cars but especially any of the convertibles due to structural concerns.
Ah- makes sense. You know, way back in the late 90's, I had a 68 340/4spd fastback. I can't remember if it had them or not. It is possible stick cars and the big blocks would get them. I don't know why I have always loved these 3 years of cars, but there is just something about them!