That is a release cable for the tumble portion. I DO have a picture of that....
This is from "above" or more correctly, if you removed the seat padding, you would see this.
View attachment 89918
Here is where they will attach to the seat back...
View attachment 89919
EDIT - I just read your post again. They probably just look different because of the pic being taken from above. (Wow. You were that crazy man that redid his entire seats foam huh?! Good job!)
I'm pretty sure those are 97-02 seats. My new ones I'm trying to put in are 03-06. Completely different bracket. But thanks to your post I was able to figure out where the cable went on. Pretty simple. Much thanks for the pics.