[deliriousga]

This is for a MY '00. Don't know if it has changed over the years.

The inside cover screws on. It's toward the front of the cover piece on top of the middle plastic piece. There's a small hole in there for the screw. I believe it screws to the floor and not the seat frame, but don't quote me on that.

The outer cover clips on . One of mine broke off when I pulled it out so yours may be broken. The clip is in the center piece of plastic that is between the two runner covers. If you have a big, rectangular hole in that center piece, you're missing the clipping part. Also, if you don't have the center plastic piece, you're missing the clip.