You should install the cushion pad to the seat back, the seat back trim cover over the seat back working the cover down and over the foam, the SIAB side inflatable restraint module, the fir tree retainers that secure the seat back cover to the seat back frame, the J-hooks that secure the seat back cover to the bottom of the seat back, the seat speakers, the seat speaker grilles, the seat back insert and the seat to the vehicle.