Hip Pad Ship Set compatible with most pocket style hip pad sets. Most often used with zipper hip pads common on Perception, Wilderness Systems, Dagger and Wave Sport kayaks. Can be use in any way you see fit. Each kit comes with 8 shims total. 4 thick shims and 4 thin shims. Each shim is wedge shape, 5.25 inches by 5.25 inches, square. Confluence Part Numbers; 9800588 and 3135-1133. See hip pads installed and adjusted in the Seat Modification Video at five minutes 30 seconds. CRCK