Camaro seatback backs

[olredalert]

-----I just dont know if I have been hit with the reproduction blues or what. I bought reproduction plastic seat backs for 69 Camaro deluxe seats and once over the clips they wont go far enough down on those clips to push them in on the bottom and insert the two screws. They miss buy about a half inch. I relieved one of them a bit and now it still wont quite get down far enough but go too far down on the top and show the fabric attachment strip on the seat cover itself. Anybody else have this problem??? Am I overlooking something simple???........Bill S