Some items from this specific schematic: Cush,rr.*nh-1, Bush, Damper, Washer,12.2x26, Seat,spg Upper.
This Rear Shock Absorber 78-81 diagram displays the required parts for the Xl250s 1979 (z) Usa Rear Shock Absorber 78-81.
The Rear Shock Absorber 78-81 is made up of components including this Cushion Rr which is the most expensive.