Seats come w/ threaded holes for the hinges, you'll need 4 short 10mm bolts, 2 hinge bolts and 2 cinch pins (otherwise you'll lose the hinge bolts to vibration after a ride; been there, done that). Tip: Just hand-tighten the bolts when installing hinges. After hinges are in place, tighten the bolts. Makes hinge installation much easier. And you can substitute common machine screws if you don't have any hinge bolts handy.