Thats because they didnt come with the trap door if this is for the 4.6is. I asked and thats the answer I continued to get. However the trap door does fit but cant recall if its the the one from the 4.4 or 3.0 after lengthy threads being read and researched on my part I found it to be true since they used the same stiffener plate. Facelift models as I understand it are different config and piece may not fit. Ill dig and see if I kept the part number tonight for you.

EDIT: I am pretty sure this is the number 51 71 8 268 897