OK, so I confirmed this with production.
Install the swivel ped first.
There are (2) flat metal plates, those go on after. When you slide the seat over (45 degree angle) that leaves a big gap where you can see the floor. Those plates are called "pinch plates" they just clip over that hole using christmas tree plastic bolts? push pins?. That keeps you from getting your fingers caught in that hole somehow when sliding back.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).