demon split bench seatback mounting with center armrest??

I put new legendary covers on my seats. Long time ago. I got the bottom front bolted in. I installed the center armrest using the two chrome buttonhead screws. Now I am looking at the seatbacks and I guess I forgot to punch holes in the interior facing sides so that the two studs go into the seatback on the inside or center where the center armrest is. I am trying to feel through the new seatcover to make a hole, but I am not feeling where to make it. I should have taken a picture. Can anybody on here help me as to where the fixed studs are suppose to enter into the seatback next to the armrest. The outside is self explanatory.