The Screw,tapping,5x16 is the cheapest item from this partsfiche.
Parts such as the Seat/rear Fender: Fender Set, Rr. (wl), Leather Comp,seat, Leather Comp,seat, Fender Set, Rr. (wl) are included in the Crf50f 2011 (a) Australia Seat/rear Fender parts fiche.
The Seat/rear Fender is made up of components including this Seat Comp,single which is the most expensive.