The Rm250 1999 (x) Usa (e03) Rear Swinging Arm (model Y) consists of twenty-five pieces with the Swing Arm Assembly,rear being the most expensive.
The lowest price component in this Rear Swinging Arm (model Y) parts-list fiche is the Washer, Fixed Drive Face.
In this schematic the "Screw,upper" is used most often.