once you pull the seat assembly from the van you will see that the cover is held on by either metal hog rings or a plastic "j" channel along the perimeter of the cover. you can use a pair of pliers to release the hog rings but, you may have to replace them when you install the new cover. the plastic "j" moulding is just a friction fit and will release with a little help.
a quick tip is to spray the seat foam with a silicone spray to allow the new cover to slide right on without too much fuss.
a quick tip is to spray the seat foam with a silicone spray to allow the new cover to slide right on without too much fuss.