Flip the seat over, so the bottom of the seat cushion is facing you. There are four (4) push pins that hold the cushion leather to the seat frame (see Figure #2, red circles). There is also a screw on each side holding the front of the bolster leather in place (see Figure #2, red arrows). Remove the push pins and and screws while you have the seat upside down. Afterwards, lift the front of the cushion upholstery up so that it is loose. You will also see two plastic clips that hold the listing wire in the foam to the seat pan. Squeeze the ends of the clips together and push the clips up from the bottom through the seat pan (see Figure #2, green arrows. Also Figure #3). Be careful not to break them. The back of the leather upholstery on the cushion is held in by a J-clip that is clipped to the back of the seat pan. It is easily accessible from the back of the seat.
After the cushion section is removed, you will see hog-rings along the perimeter of the cushion. Remove the hog-rings, and then fold the cover up to reveal hog-rings holding the insert seams to the cushion. Remove these hog-rings and remove the cover from the foam. Installation is the reverse of removal. Start with the cover inside-out, and then hog-ring the insert sections. Fold the cover over the foam, and hog-ring the cover to the perimeter of the foam. Set the cushion aside after the Leatherseats.com cover is hog-ringed to the foam.