2000 suburban seat wiggle. Please Help.

[shewentwest]

2000 suburban 2500 four bucket seats. I just bought this truck and very happy with it.I have one problem when Im riding in the front passenger seat. It has a forward and back wiggle or play. Its only about a 16th of an inch but it is driving me nuts. My husband doesnt notice this. He thinks its because I dont weigh much or im not sitting right.? WHAT? My question is how can I get the seat to stay still? I took the side trim piece off and their doesnt seem to be a easy way to adjust it.

Any help is appreciated!