Of all the components used in this assembly the Seat Assy,double is the most expensive.
Some items from this specific schematic: Rub,seat Stopper, Bolt,flange,8x12, Cowl,seat*r-33*, Cowl*b-100m-u*.
The most reasonably priced component used on the Cb250rs 1980 (a) South Africa Seat - Seat Cowl is the Screw,tap.,5x16.