The twenty-one Yzf-r3a 2015 B023 Europe 1pb02-300e1 24 Seat component parts are all listed in this schematic.
The 24 Seat is made up of components including this Tandem Seat Assy which is the most expensive.
A sample from the products for the 24 Seat include: Nut, Flange(4mv), Stay, Lock, O/m Yzf-r3a'15, Screw, Tapping.