ok so based on the url and the pics and your pics. the latches are totally separate from both the head rest and the middle insert. seems they would get lost if not connected to anything.
seems easy enough to buy two latches i guess. then buy this aftermarket which is for the money a better deal than oem to me.
http://www.kingpennindustries.com/WindR/WRproductdetail2.aspx?wrid=8