Thats the way it's supposed to be, but my car had the 3 ribbed lid originally.
SJ was probably using up those lids since they quit making Cougars.
It had some splits in it when I bought the car, so I changed it out to the flat lid which is better because stuff doesn't fall off of it.
I do like the metal Cougar hinge though and changed out the plastic hinge that was breaking.
They put the deluxe lid on my car to get rid of it, but still used the junk plastic hinge, how cheap can you be?