"Build Sheet."

I found mine on the top half of the back seat. I don't know of this is true or not, but I read somewhere on a forum that cars from the Canadian Windsor factory out most of their build sheets on the top half of the back seat between the springs. Not sure if that's true but it's where I found mine (and my Dart came from the Windsor plant). I also found the remnants of another build sheet under the back half of my original carpet.