TM 9-2320-361-20 11-29. DRIVER’S SEAT CUSHION, BACKREST, FRAME, AND SEAT ADJUSTER REPLACEMENT (Contd) h. Driver’s Seat Cushion Installation 1. Position two washers (13), seat cushion brackets (16), and seat cushion (17) on frame (3). 2. Install two seat cushion brackets (16), two washers (13), and seat cushion (17) on seat frame (3) with four screws (14) and new lockwashers (15). - 11-51