No studs or conchos Deeply pocketed driver seat Seat sits the driver 1/4in. lower than stock Passenger seat utilizes unique internal steel support wings Driver seat comes with an adjustable, easily removable backrest and the passenger seat comes with a receiver for a backrest Driver backrest can also be used in the passenger seat receiver Driver backrest adjusts forward and back, different height adjustments and is easily removed without tools A second backrest for passenger sold separately Front Width: 15.5in. Rear Width: 12in.